10 typical and practical PHP code snippets
This article will introduce 10 frequently used PHP code snippets, including blacklist filtering, random color generator, downloading files from the Internet, Alexa/Google Page Rank, forced downloading of files, and displaying the user's email address Gravator avatar, use cURL to get the number of RSS subscriptions, capture pictures, and check whether the website is down.
1. Blacklist filtering
<ol class="dp-c"><li class="alt"><span><span class="keyword">function</span><span> is_spam(</span><span class="vars">$text</span><span>, </span><span class="vars">$file</span><span>, </span><span class="vars">$split</span><span> = </span><span class="string">':'</span><span>, </span><span class="vars">$regex</span><span> = false){ </span></span></li><li><span> <span class="vars">$handle</span><span> = </span><span class="func">fopen</span><span>(</span><span class="vars">$file</span><span>, </span><span class="string">'rb'</span><span>); </span></span></li><li class="alt"><span> <span class="vars">$contents</span><span> = </span><span class="func">fread</span><span>(</span><span class="vars">$handle</span><span>, </span><span class="func">filesize</span><span>(</span><span class="vars">$file</span><span>)); </span></span></li><li><span> fclose(<span class="vars">$handle</span><span>); </span></span></li><li class="alt"><span> <span class="vars">$lines</span><span> = </span><span class="func">explode</span><span>(</span><span class="string">"n"</span><span>, </span><span class="vars">$contents</span><span>); </span></span></li><li><span><span class="vars">$arr</span><span> = </span><span class="keyword">array</span><span>(); </span></span></li><li class="alt"><span><span class="keyword">foreach</span><span>(</span><span class="vars">$lines</span><span> </span><span class="keyword">as</span><span> </span><span class="vars">$line</span><span>){ </span></span></li><li><span>list(<span class="vars">$word</span><span>, </span><span class="vars">$count</span><span>) = </span><span class="func">explode</span><span>(</span><span class="vars">$split</span><span>, </span><span class="vars">$line</span><span>); </span></span></li><li class="alt"><span><span class="keyword">if</span><span>(</span><span class="vars">$regex</span><span>) </span></span></li><li><span><span class="vars">$arr</span><span>[</span><span class="vars">$word</span><span>] = </span><span class="vars">$count</span><span>; </span></span></li><li class="alt"><span><span class="keyword">else</span><span> </span></span></li><li><span><span class="vars">$arr</span><span>[preg_quote(</span><span class="vars">$word</span><span>)] = </span><span class="vars">$count</span><span>; </span></span></li><li class="alt"><span>} </span></li><li><span>preg_match_all(<span class="string">"~"</span><span>.implode(</span><span class="string">'|'</span><span>, </span><span class="func">array_keys</span><span>(</span><span class="vars">$arr</span><span>)).</span><span class="string">"~"</span><span>, </span><span class="vars">$text</span><span>, </span><span class="vars">$matches</span><span>); </span></span></li><li class="alt"><span><span class="vars">$temp</span><span> = </span><span class="keyword">array</span><span>(); </span></span></li><li><span><span class="keyword">foreach</span><span>(</span><span class="vars">$matches</span><span>[0] </span><span class="keyword">as</span><span> </span><span class="vars">$match</span><span>){ </span></span></li><li class="alt"><span><span class="keyword">if</span><span>(!in_array(</span><span class="vars">$match</span><span>, </span><span class="vars">$temp</span><span>)){ </span></span></li><li><span><span class="vars">$temp</span><span>[</span><span class="vars">$match</span><span>] = </span><span class="vars">$temp</span><span>[</span><span class="vars">$match</span><span>] + 1; </span></span></li><li class="alt"><span><span class="keyword">if</span><span>(</span><span class="vars">$temp</span><span>[</span><span class="vars">$match</span><span>] >= </span><span class="vars">$arr</span><span>[</span><span class="vars">$word</span><span>]) </span></span></li><li><span><span class="keyword">return</span><span> true; </span></span></li><li class="alt"><span>} </span></li><li><span>} </span></li><li class="alt"><span><span class="keyword">return</span><span> false; </span></span></li><li><span>} </span></li><li class="alt"><span> </span></li><li><span><span class="vars">$file</span><span> = </span><span class="string">'spam.txt'</span><span>; </span></span></li><li class="alt"><span><span class="vars">$str</span><span> = </span><span class="string">'This string has cat, dog word'</span><span>; </span></span></li><li><span><span class="keyword">if</span><span>(is_spam(</span><span class="vars">$str</span><span>, </span><span class="vars">$file</span><span>)) </span></span></li><li class="alt"><span><span class="func">echo</span><span> </span><span class="string">'this is spam'</span><span>; </span></span></li><li><span><span class="keyword">else</span><span> </span></span></li><li class="alt"><span><span class="func">echo</span><span> </span><span class="string">'this is not spam'</span><span>; </span></span></li><li><span> </span></li><li class="alt"><span>ab:3 </span></li><li><span>dog:3 </span></li><li class="alt"><span>cat:2 </span></li><li><span>monkey:2 </span></li></ol>
2. Random color generator
<ol class="dp-c"><li class="alt"><span><span class="keyword">function</span><span> randomColor() { </span></span></li><li><span> <span class="vars">$str</span><span> = </span><span class="string">'#'</span><span>; </span></span></li><li class="alt"><span> <span class="keyword">for</span><span>(</span><span class="vars">$i</span><span> = 0 ; </span><span class="vars">$i</span><span> < 6 ; </span><span class="vars">$i</span><span>++) { </span></span></li><li><span> <span class="vars">$randNum</span><span> = rand(0 , 15); </span></span></li><li class="alt"><span> <span class="keyword">switch</span><span> (</span><span class="vars">$randNum</span><span>) { </span></span></li><li><span> <span class="keyword">case</span><span> 10: </span><span class="vars">$randNum</span><span> = </span><span class="string">'A'</span><span>; </span><span class="keyword">break</span><span>; </span></span></li><li class="alt"><span> <span class="keyword">case</span><span> 11: </span><span class="vars">$randNum</span><span> = </span><span class="string">'B'</span><span>; </span><span class="keyword">break</span><span>; </span></span></li><li><span> <span class="keyword">case</span><span> 12: </span><span class="vars">$randNum</span><span> = </span><span class="string">'C'</span><span>; </span><span class="keyword">break</span><span>; </span></span></li><li class="alt"><span> <span class="keyword">case</span><span> 13: </span><span class="vars">$randNum</span><span> = </span><span class="string">'D'</span><span>; </span><span class="keyword">break</span><span>; </span></span></li><li><span> <span class="keyword">case</span><span> 14: </span><span class="vars">$randNum</span><span> = </span><span class="string">'E'</span><span>; </span><span class="keyword">break</span><span>; </span></span></li><li class="alt"><span> <span class="keyword">case</span><span> 15: </span><span class="vars">$randNum</span><span> = </span><span class="string">'F'</span><span>; </span><span class="keyword">break</span><span>; </span></span></li><li><span> } </span></li><li class="alt"><span> <span class="vars">$str</span><span> .= </span><span class="vars">$randNum</span><span>; </span></span></li><li><span> } </span></li><li class="alt"><span> <span class="keyword">return</span><span> </span><span class="vars">$str</span><span>; </span></span></li><li><span>} </span></li><li class="alt"><span><span class="vars">$color</span><span> = randomColor(); </span></span></li></ol>
3. Download files from the Internet
<ol class="dp-c"><li class="alt"><span><span>set_time_limit(0); </span></span></li><li><span><span class="comment">// Supports all file types</span><span> </span></span></li><li class="alt"><span><span class="comment">// URL Here:</span><span> </span></span></li><li><span><span class="vars">$url</span><span> = </span><span class="string">'http://somsite.com/some_video.flv'</span><span>; </span></span></li><li class="alt"><span><span class="vars">$pi</span><span> = </span><span class="func">pathinfo</span><span>(</span><span class="vars">$url</span><span>); </span></span></li><li><span><span class="vars">$ext</span><span> = </span><span class="vars">$pi</span><span>[</span><span class="string">'extension'</span><span>]; </span></span></li><li class="alt"><span><span class="vars">$name</span><span> = </span><span class="vars">$pi</span><span>[</span><span class="string">'filename'</span><span>]; </span></span></li><li><span> </span></li><li class="alt"><span><span class="comment">// create a new cURL resource</span><span> </span></span></li><li><span><span class="vars">$ch</span><span> = curl_init(); </span></span></li><li class="alt"><span> </span></li><li><span><span class="comment">// set URL and other appropriate options</span><span> </span></span></li><li class="alt"><span>curl_setopt(<span class="vars">$ch</span><span>, CURLOPT_URL, </span><span class="vars">$url</span><span>); </span></span></li><li><span>curl_setopt(<span class="vars">$ch</span><span>, CURLOPT_HEADER, false); </span></span></li><li class="alt"><span>curl_setopt(<span class="vars">$ch</span><span>, CURLOPT_BINARYTRANSFER, true); </span></span></li><li><span>curl_setopt(<span class="vars">$ch</span><span>, CURLOPT_AUTOREFERER, true); </span></span></li><li class="alt"><span>curl_setopt(<span class="vars">$ch</span><span>, CURLOPT_FOLLOWLOCATION, true); </span></span></li><li><span>curl_setopt(<span class="vars">$ch</span><span>, CURLOPT_RETURNTRANSFER, true); </span></span></li><li class="alt"><span> </span></li><li><span><span class="comment">// grab URL and pass it to the browser</span><span> </span></span></li><li class="alt"><span><span class="vars">$opt</span><span> = curl_exec(</span><span class="vars">$ch</span><span>); </span></span></li><li><span> </span></li><li class="alt"><span><span class="comment">// close cURL resource, and free up system resources</span><span> </span></span></li><li><span>curl_close(<span class="vars">$ch</span><span>); </span></span></li><li class="alt"><span> </span></li><li><span><span class="vars">$saveFile</span><span> = </span><span class="vars">$name</span><span>.</span><span class="string">'.'</span><span>.</span><span class="vars">$ext</span><span>; </span></span></li><li class="alt"><span><span class="keyword">if</span><span>(preg_match(</span><span class="string">"/[^0-9a-z._-]/i"</span><span>, </span><span class="vars">$saveFile</span><span>)) </span></span></li><li><span><span class="vars">$saveFile</span><span> = md5(microtime(true)).</span><span class="string">'.'</span><span>.</span><span class="vars">$ext</span><span>; </span></span></li><li class="alt"><span> </span></li><li><span><span class="vars">$handle</span><span> = </span><span class="func">fopen</span><span>(</span><span class="vars">$saveFile</span><span>, </span><span class="string">'wb'</span><span>); </span></span></li><li class="alt"><span>fwrite(<span class="vars">$handle</span><span>, </span><span class="vars">$opt</span><span>); </span></span></li><li><span>fclose(<span class="vars">$handle</span><span>); </span></span></li></ol>
4. Alexa/Google Page Rank
<ol class="dp-c"><li class="alt"><span><span class="keyword">function</span><span> page_rank(</span><span class="vars">$page</span><span>, </span><span class="vars">$type</span><span> = </span><span class="string">'alexa'</span><span>){ </span></span></li><li><span><span class="keyword">switch</span><span>(</span><span class="vars">$type</span><span>){ </span></span></li><li class="alt"><span><span class="keyword">case</span><span> </span><span class="string">'alexa'</span><span>: </span></span></li><li><span><span class="vars">$url</span><span> = </span><span class="string">'http://alexa.com/siteinfo/'</span><span>; </span></span></li><li class="alt"><span><span class="vars">$handle</span><span> = </span><span class="func">fopen</span><span>(</span><span class="vars">$url</span><span>.</span><span class="vars">$page</span><span>, </span><span class="string">'r'</span><span>); </span></span></li><li><span><span class="keyword">break</span><span>; </span></span></li><li class="alt"><span><span class="keyword">case</span><span> </span><span class="string">'google'</span><span>: </span></span></li><li><span><span class="vars">$url</span><span> = </span><span class="string">'http://google.com/search?client=navclient-auto&ch=6-1484155081&features=Rank&q=info:'</span><span>; </span></span></li><li class="alt"><span><span class="vars">$handle</span><span> = </span><span class="func">fopen</span><span>(</span><span class="vars">$url</span><span>.</span><span class="string">'http://'</span><span>.</span><span class="vars">$page</span><span>, </span><span class="string">'r'</span><span>); </span></span></li><li><span><span class="keyword">break</span><span>; </span></span></li><li class="alt"><span>} </span></li><li><span><span class="vars">$content</span><span> = stream_get_contents(</span><span class="vars">$handle</span><span>); </span></span></li><li class="alt"><span>fclose(<span class="vars">$handle</span><span>); </span></span></li><li><span><span class="vars">$content</span><span> = preg_replace(</span><span class="string">"~(n|t|ss+)~"</span><span>,</span><span class="string">''</span><span>, </span><span class="vars">$content</span><span>); </span></span></li><li class="alt"><span><span class="keyword">switch</span><span>(</span><span class="vars">$type</span><span>){ </span></span></li><li><span><span class="keyword">case</span><span> </span><span class="string">'alexa'</span><span>: </span></span></li><li class="alt"><span><span class="keyword">if</span><span>(preg_match(</span><span class="string">'~<div class="data (down|up)"><img src="/static/imghwm/default1.png" data-src="http://www.bkjia.com/uploads/allimg/151012/152R41955-1.jpg?x-oss-process=image/resize,p_40" class="lazy" .+? alt="10 Typical and Practical PHP Code Snippets_PHP Tutorial" >(.+?) </div>~im'</span><span>,</span><span class="vars">$content</span><span>,</span><span class="vars">$matches</span><span>)){ </span></span></li><li><span><span class="keyword">return</span><span> </span><span class="vars">$matches</span><span>[2]; </span></span></li><li class="alt"><span>}<span class="keyword">else</span><span>{ </span></span></li><li><span><span class="keyword">return</span><span> FALSE; </span></span></li><li class="alt"><span>} </span></li><li><span><span class="keyword">break</span><span>; </span></span></li><li class="alt"><span><span class="keyword">case</span><span> </span><span class="string">'google'</span><span>: </span></span></li><li><span><span class="vars">$rank</span><span> = </span><span class="func">explode</span><span>(</span><span class="string">':'</span><span>,</span><span class="vars">$content</span><span>); </span></span></li><li class="alt"><span><span class="keyword">if</span><span>(</span><span class="vars">$rank</span><span>[2] != </span><span class="string">''</span><span>) </span></span></li><li><span><span class="keyword">return</span><span> </span><span class="vars">$rank</span><span>[2]; </span></span></li><li class="alt"><span><span class="keyword">else</span><span> </span></span></li><li><span><span class="keyword">return</span><span> FALSE; </span></span></li><li class="alt"><span><span class="keyword">break</span><span>; </span></span></li><li><span><span class="keyword">default</span><span>: </span></span></li><li class="alt"><span><span class="keyword">return</span><span> FALSE; </span></span></li><li><span><span class="keyword">break</span><span>; </span></span></li><li class="alt"><span>} </span></li><li><span>} </span></li><li class="alt"><span><span class="comment">// Alexa Page Rank:</span><span> </span></span></li><li><span><span class="func">echo</span><span> </span><span class="string">'Alexa Rank: '</span><span>.page_rank(</span><span class="string">'techug.com'</span><span>); </span></span></li><li class="alt"><span><span class="func">echo</span><span> </span><span class="string">' '</span><span>; </span></span></li><li><span><span class="comment">// Google Page Rank</span><span> </span></span></li><li class="alt"><span><span class="func">echo</span><span> </span><span class="string">'Google Rank: '</span><span>.page_rank(</span><span class="string">'techug.com'</span><span>, </span><span class="string">'google'</span><span>); </span></span></li></ol>
5. Forced file download
<ol class="dp-c"><li class="alt"><span><span class="vars">$filename</span><span> = </span><span class="vars">$_GET</span><span>[</span><span class="string">'file'</span><span>]; </span><span class="comment">//Get the fileid from the URL</span><span> </span></span></li><li><span><span class="comment">// Query the file ID</span><span> </span></span></li><li class="alt"><span><span class="vars">$query</span><span> = sprintf(</span><span class="string">"SELECT * FROM tableName WHERE id = '%s'"</span><span>,mysql_real_escape_string(</span><span class="vars">$filename</span><span>)); </span></span></li><li><span><span class="vars">$sql</span><span> = mysql_query(</span><span class="vars">$query</span><span>); </span></span></li><li class="alt"><span><span class="keyword">if</span><span>(mysql_num_rows(</span><span class="vars">$sql</span><span>) > 0){ </span></span></li><li><span><span class="vars">$row</span><span> = mysql_fetch_array(</span><span class="vars">$sql</span><span>); </span></span></li><li class="alt"><span><span class="comment">// Set some headers</span><span> </span></span></li><li><span>header(<span class="string">"Pragma: public"</span><span>); </span></span></li><li class="alt"><span>header(<span class="string">"Expires: 0"</span><span>); </span></span></li><li><span>header(<span class="string">"Cache-Control: must-revalidate, post-check=0, pre-check=0"</span><span>); </span></span></li><li class="alt"><span>header(<span class="string">"Content-Type: application/force-download"</span><span>); </span></span></li><li><span>header(<span class="string">"Content-Type: application/octet-stream"</span><span>); </span></span></li><li class="alt"><span>header(<span class="string">"Content-Type: application/download"</span><span>); </span></span></li><li><span>header(<span class="string">"Content-Disposition: attachment; filename="</span><span>.</span><span class="func">basename</span><span>(</span><span class="vars">$row</span><span>[</span><span class="string">'FileName'</span><span>]).</span><span class="string">";"</span><span>); </span></span></li><li class="alt"><span>header(<span class="string">"Content-Transfer-Encoding: binary"</span><span>); </span></span></li><li><span>header(<span class="string">"Content-Length: "</span><span>.</span><span class="func">filesize</span><span>(</span><span class="vars">$row</span><span>[</span><span class="string">'FileName'</span><span>])); </span></span></li><li class="alt"><span> </span></li><li><span>@readfile(<span class="vars">$row</span><span>[</span><span class="string">'FileName'</span><span>]); </span></span></li><li class="alt"><span><span class="func">exit</span><span>(0); </span></span></li><li><span>}<span class="keyword">else</span><span>{ </span></span></li><li class="alt"><span>header(<span class="string">"Location: /"</span><span>); </span></span></li><li><span><span class="func">exit</span><span>; </span></span></li><li class="alt"><span>} </span></li></ol>
6. Use Email to display the user’s Gravator avatar
<ol class="dp-c"><li class="alt"><span><span class="vars">$gravatar_link</span><span> = </span><span class="string">'http://www.gravatar.com/avatar/'</span><span> . md5(</span><span class="vars">$comment_author_email</span><span>) . </span><span class="string">'?s=32'</span><span>; </span></span></li><li><span><span class="func">echo</span><span> </span><span class="string">'<img src="/static/imghwm/default1.png" data-src="http://www.bkjia.com/uploads/allimg/151012/152R41955-1.jpg?x-oss-process=image/resize,p_40" class="lazy" </span alt="10 Typical and Practical PHP Code Snippets_PHP Tutorial" ><span> . </span><span class="vars">$gravatar_link</span><span> . </span><span class="string">'" />'</span><span>; </span></span></li></ol>
7. Use cURL to get the number of RSS subscriptions
<ol class="dp-c"><li class="alt"><span><span class="vars">$ch</span><span> = curl_init(); </span></span></li><li><span>curl_setopt(<span class="vars">$ch</span><span>,CURLOPT_URL,</span><span class="string">'https://feedburner.google.com/api/awareness/1.0/GetFeedData?id=7qkrmib4r9rscbplq5qgadiiq4'</span><span>); </span></span></li><li class="alt"><span>curl_setopt(<span class="vars">$ch</span><span>,CURLOPT_RETURNTRANSFER,1); </span></span></li><li><span>curl_setopt(<span class="vars">$ch</span><span>,CURLOPT_CONNECTTIMEOUT,2); </span></span></li><li class="alt"><span><span class="vars">$content</span><span> = curl_exec(</span><span class="vars">$ch</span><span>); </span></span></li><li><span><span class="vars">$subscribers</span><span> = get_match(</span><span class="string">'/circulation="(.*)"/isU'</span><span>,</span><span class="vars">$content</span><span>); </span></span></li><li class="alt"><span>curl_close(<span class="vars">$ch</span><span>); </span></span></li></ol>
8. Time difference calculation
<ol class="dp-j"><li class="alt"><span><span>function ago($time) </span></span></li><li><span>{ </span></li><li class="alt"><span> $periods = array(<span class="string">"second"</span><span>, </span><span class="string">"minute"</span><span>, </span><span class="string">"hour"</span><span>, </span><span class="string">"day"</span><span>, </span><span class="string">"week"</span><span>, </span><span class="string">"month"</span><span>, </span><span class="string">"year"</span><span>, </span><span class="string">"decade"</span><span>); </span></span></li><li><span>$lengths = array(<span class="string">"60"</span><span>,</span><span class="string">"60"</span><span>,</span><span class="string">"24"</span><span>,</span><span class="string">"7"</span><span>,</span><span class="string">"4.35"</span><span>,</span><span class="string">"12"</span><span>,</span><span class="string">"10"</span><span>); </span></span></li><li class="alt"><span> </span></li><li><span>$now = time(); </span></li><li class="alt"><span> </span></li><li><span>$difference = $now - $time; </span></li><li class="alt"><span>$tense = <span class="string">"ago"</span><span>; </span></span></li><li><span> </span></li><li class="alt"><span><span class="keyword">for</span><span>($j = </span><span class="number">0</span><span>; $difference >= $lengths[$j] && $j < count($lengths)-</span><span class="number">1</span><span>; $j++) { </span></span></li><li><span>$difference /= $lengths[$j]; </span></li><li class="alt"><span>} </span></li><li><span> </span></li><li class="alt"><span>$difference = round($difference); </span></li><li><span> </span></li><li class="alt"><span><span class="keyword">if</span><span>($difference != </span><span class="number">1</span><span>) { </span></span></li><li><span>$periods[$j].= <span class="string">"s"</span><span>; </span></span></li><li class="alt"><span>} </span></li><li><span> </span></li><li class="alt"><span><span class="keyword">return</span><span> </span><span class="string">"$difference $periods[$j] 'ago' "</span><span>; </span></span></li><li><span>} </span></li></ol>
9. Screen capture
<ol class="dp-c"><li class="alt"><span><span class="vars">$filename</span><span>= </span><span class="string">"test.jpg"</span><span>; </span></span></li><li><span>list(<span class="vars">$w</span><span>, </span><span class="vars">$h</span><span>, </span><span class="vars">$type</span><span>, </span><span class="vars">$attr</span><span>) = </span><span class="func">getimagesize</span><span>(</span><span class="vars">$filename</span><span>); </span></span></li><li class="alt"><span><span class="vars">$src_im</span><span> = imagecreatefromjpeg(</span><span class="vars">$filename</span><span>); </span></span></li><li><span> </span></li><li class="alt"><span><span class="vars">$src_x</span><span> = </span><span class="string">'0'</span><span>; </span><span class="comment">// begin x</span><span> </span></span></li><li><span><span class="vars">$src_y</span><span> = </span><span class="string">'0'</span><span>; </span><span class="comment">// begin y</span><span> </span></span></li><li class="alt"><span><span class="vars">$src_w</span><span> = </span><span class="string">'100'</span><span>; </span><span class="comment">// width</span><span> </span></span></li><li><span><span class="vars">$src_h</span><span> = </span><span class="string">'100'</span><span>; </span><span class="comment">// height</span><span> </span></span></li><li class="alt"><span><span class="vars">$dst_x</span><span> = </span><span class="string">'0'</span><span>; </span><span class="comment">// destination x</span><span> </span></span></li><li><span><span class="vars">$dst_y</span><span> = </span><span class="string">'0'</span><span>; </span><span class="comment">// destination y</span><span> </span></span></li><li class="alt"><span> </span></li><li><span><span class="vars">$dst_im</span><span> = imagecreatetruecolor(</span><span class="vars">$src_w</span><span>, </span><span class="vars">$src_h</span><span>); </span></span></li><li class="alt"><span><span class="vars">$white</span><span> = imagecolorallocate(</span><span class="vars">$dst_im</span><span>, 255, 255, 255); </span></span></li><li><span>imagefill(<span class="vars">$dst_im</span><span>, 0, 0, </span><span class="vars">$white</span><span>); </span></span></li><li class="alt"><span> </span></li><li><span>imagecopy(<span class="vars">$dst_im</span><span>, </span><span class="vars">$src_im</span><span>, </span><span class="vars">$dst_x</span><span>, </span><span class="vars">$dst_y</span><span>, </span><span class="vars">$src_x</span><span>, </span><span class="vars">$src_y</span><span>, </span><span class="vars">$src_w</span><span>, </span><span class="vars">$src_h</span><span>); </span></span></li><li class="alt"><span> </span></li><li><span>header(<span class="string">"Content-type: image/png"</span><span>); </span></span></li><li class="alt"><span>imagepng(<span class="vars">$dst_im</span><span>); </span></span></li><li><span>imagedestroy(<span class="vars">$dst_im</span><span>); </span></span></li></ol>
10. Check whether the website is down
<ol class="dp-c"><li class="alt"><span><span class="keyword">function</span><span> Visit(</span><span class="vars">$url</span><span>){ </span></span></li><li><span> <span class="vars">$agent</span><span> = </span><span class="string">"Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)"</span><span>;</span><span class="vars">$ch</span><span>=curl_init(); </span></span></li><li class="alt"><span>curl_setopt (<span class="vars">$ch</span><span>, CURLOPT_URL,</span><span class="vars">$url</span><span> ); </span></span></li><li><span>curl_setopt(<span class="vars">$ch</span><span>, CURLOPT_USERAGENT, </span><span class="vars">$agent</span><span>); </span></span></li><li class="alt"><span>curl_setopt (<span class="vars">$ch</span><span>, CURLOPT_RETURNTRANSFER, 1); </span></span></li><li><span>curl_setopt (<span class="vars">$ch</span><span>,CURLOPT_VERBOSE,false); </span></span></li><li class="alt"><span>curl_setopt(<span class="vars">$ch</span><span>, CURLOPT_TIMEOUT, 5); </span></span></li><li><span>curl_setopt(<span class="vars">$ch</span><span>,CURLOPT_SSL_VERIFYPEER, FALSE); </span></span></li><li class="alt"><span>curl_setopt(<span class="vars">$ch</span><span>,CURLOPT_SSLVERSION,3); </span></span></li><li><span>curl_setopt(<span class="vars">$ch</span><span>,CURLOPT_SSL_VERIFYHOST, FALSE); </span></span></li><li class="alt"><span><span class="vars">$page</span><span>=curl_exec(</span><span class="vars">$ch</span><span>); </span></span></li><li><span><span class="comment">//echo curl_error($ch);</span><span> </span></span></li><li class="alt"><span><span class="vars">$httpcode</span><span> = curl_getinfo(</span><span class="vars">$ch</span><span>, CURLINFO_HTTP_CODE); </span></span></li><li><span>curl_close(<span class="vars">$ch</span><span>); </span></span></li><li class="alt"><span><span class="keyword">if</span><span>(</span><span class="vars">$httpcode</span><span>>=200 && </span><span class="vars">$httpcode</span><span><300) </span><span class="keyword">return</span><span> true; </span></span></li><li><span><span class="keyword">else</span><span> </span><span class="keyword">return</span><span> false; </span></span></li><li class="alt"><span>} </span></li><li><span><span class="keyword">if</span><span> (Visit(</span><span class="string">"http://www.google.com"</span><span>)) </span></span></li><li class="alt"><span><span class="func">echo</span><span> </span><span class="string">"Website OK"</span><span>.</span><span class="string">"n"</span><span>; </span></span></li><li><span><span class="keyword">else</span><span> </span></span></li><li class="alt"><span><span class="func">echo</span><span> </span><span class="string">"Website DOWN"</span><span>; </span></span></li></ol>
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The Continued Use of PHP: Reasons for Its EnduranceApr 19, 2025 am 12:23 AMWhat’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.
PHP and Python: Exploring Their Similarities and DifferencesApr 19, 2025 am 12:21 AMPHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.
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PHP and Python: A Deep Dive into Their HistoryApr 18, 2025 am 12:25 AMPHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.
Choosing Between PHP and Python: A GuideApr 18, 2025 am 12:24 AMPHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.
PHP and Frameworks: Modernizing the LanguageApr 18, 2025 am 12:14 AMPHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.
PHP's Impact: Web Development and BeyondApr 18, 2025 am 12:10 AMPHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip
How does PHP type hinting work, including scalar types, return types, union types, and nullable types?Apr 17, 2025 am 12:25 AMPHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.
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