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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php字符串有没有下标Apr 24, 2022 am 11:49 AMphp字符串有下标。在PHP中，下标不仅可以应用于数组和对象，还可应用于字符串，利用字符串的下标和中括号“[]”可以访问指定索引位置的字符，并对该字符进行读写，语法“字符串名[下标值]”；字符串的下标值（索引值）只能是整数类型，起始值为0。
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