值得收藏的10个PHP代码样例(黑名单＼下载文件)

我们在开发中经常会要用到一些功能,下文小编整理了在开发应用中碰到的一些php经典代码了,下面一起来看看.

一、黑名单过滤,代码如下:

function is_spam($text, $file, $split = ':', $regex = false){  
	$handle = fopen($file, 'rb');  
	$contents = fread($handle, filesize($file));  
	fclose($handle);  
	$lines = explode("n", $contents);  
	$arr = array();  
	foreach($lines as $line){  
		list($word, $count) = explode($split, $line);  
		if($regex)  
			$arr[$word] = $count;  
		else  
			$arr[preg_quote($word)] = $count;  
	}  
	preg_match_all("~".implode('|', array_keys($arr))."~", $text, $matches);  
	$temp = array();  
	foreach($matches[0] as $match){  
		if(!in_array($match, $temp)){  
			$temp[$match] = $temp[$match] + 1;  
			if($temp[$match] >= $arr[$word])  
				return true;  
		}  
	}  
	return false;  
}
$file = 'spam.txt';  
$str = 'This string has cat, dog word';  
if(is_spam($str, $file))  
	echo 'this is spam';  
else  
	echo 'this is not spam'; 
ab:3 
dog:3 
cat:2 
monkey:2

二、随机颜色生成器,代码如下:

function randomColor() {  
	$str = '#';  
	for($i = 0 ; $i < 6 ; $i++) {  
		$randNum = rand(0 , 15);  
		switch ($randNum) {  
			case 10: $randNum = &#39;A&#39;; break;  
			case 11: $randNum = &#39;B&#39;; break;  
			case 12: $randNum = &#39;C&#39;; break;  
			case 13: $randNum = &#39;D&#39;; break;  
			case 14: $randNum = &#39;E&#39;; break;  
			case 15: $randNum = &#39;F&#39;; break;  
		}  
		$str .= $randNum;  
	}  
	return $str;  
}  
$color = randomColor();

三、从网上下载文件,代码如下:

set_time_limit(0);  
// Supports all file types  
// URL Here:  
$url = 'http://somsite.com/some_video.flv';  
$pi = pathinfo($url);  
$ext = $pi['extension'];  
$name = $pi['filename']; 
// create a new cURL resource  
$ch = curl_init(); 
// set URL and other appropriate options  
curl_setopt($ch, CURLOPT_URL, $url);  
curl_setopt($ch, CURLOPT_HEADER, false);  
curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);  
curl_setopt($ch, CURLOPT_AUTOREFERER, true);  
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);  
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
// grab URL and pass it to the browser  
$opt = curl_exec($ch); 
// close cURL resource, and free up system resources  
curl_close($ch); 
$saveFile = $name.'.'.$ext;  
if(preg_match("/[^0-9a-z._-]/i", $saveFile))  
	$saveFile = md5(microtime(true)).'.'.$ext; 
$handle = fopen($saveFile, 'wb');  
fwrite($handle, $opt);  
fclose($handle);

四、Alexa/Google Page Rank,代码如下:

function page_rank($page, $type = 'alexa'){  
	switch($type){  
		case 'alexa':  
			$url = 'http://alexa.com/siteinfo/';  
			$handle = fopen($url.$page, 'r');  
		break;  
		case 'google':  
			$url = 'http://google.com/search?client=navclient-auto&ch=6-1484155081&features=Rank&q=info:';  
			$handle = fopen($url.'http://'.$page, 'r');  
		break;  
	}  
	$content = stream_get_contents($handle);  
	fclose($handle);  
	$content = preg_replace("~(n|t|ss+)~",'', $content);  
	switch($type){  
		case 'alexa':  
			if(preg_match(&#39;~<div class="data (down|up)"><img  src="/static/imghwm/default1.png"  data-src="&#39; . $gravatar_link . &#39;"  class="lazy" .+? alt="值得收藏的10个PHP代码样例(黑名单＼下载文件) " >(.+?) </div>~im&#39;,$content,$matches)){  
				return $matches[2];  
			}else{  
				return FALSE;  
			}  
		break;  
		case &#39;google&#39;:  
			$rank = explode(&#39;:&#39;,$content);  
			if($rank[2] != &#39;&#39;)  
				return $rank[2];  
			else  
				return FALSE;  
		break;  
		default:  
			return FALSE;  
		break;  
	}  
}  
// Alexa Page Rank:  
echo &#39;Alexa Rank: &#39;.page_rank(&#39;techug.com&#39;);  
echo &#39;   
&#39;;  
// Google Page Rank  
echo &#39;Google Rank: &#39;.page_rank(&#39;techug.com&#39;, &#39;google&#39;);

五、强制下载文件,代码如下:

$filename = $_GET['file']; //Get the fileid from the URL  
// Query the file ID  
$query = sprintf("SELECT * FROM tableName WHERE id = '%s'",mysql_real_escape_string($filename));  
$sql = mysql_query($query);  
if(mysql_num_rows($sql) > 0){  
	$row = mysql_fetch_array($sql);  
	// Set some headers  
	header("Pragma: public");  
	header("Expires: 0");  
	header("Cache-Control: must-revalidate, post-check=0, pre-check=0");  
	header("Content-Type: application/force-download");  
	header("Content-Type: application/octet-stream");  
	header("Content-Type: application/download");  
	header("Content-Disposition: attachment; filename=".basename($row['FileName']).";");  
	header("Content-Transfer-Encoding: binary");  
	header("Content-Length: ".filesize($row['FileName'])); 
	@readfile($row['FileName']);  
	exit(0);  
}else{  
	header("Location: /");  
	exit;  
}

六、用Email显示用户的Gravator头像

$gravatar_link = 'http://www.gravatar.com/avatar/' . md5($comment_author_email) . '?s=32'; 
echo &#39;<img  src="/static/imghwm/default1.png"  data-src="&#39; . $gravatar_link . &#39;"  class="lazy"   / alt="值得收藏的10个PHP代码样例(黑名单＼下载文件) " >&#39;;

七、用cURL获取RSS订阅数,代码如下:

$ch = curl_init(); 
curl_setopt($ch,CURLOPT_URL,'https://feedburner.google.com/api/awareness/1.0/GetFeedData?id=7qkrmib4r9rscbplq5qgadiiq4'); 
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1); 
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,2); 
$content = curl_exec($ch); 
$subscribers = get_match('/circulation="(.*)"/isU',$content); 
curl_close($ch);

八、时间差异计算,代码如下:

function ago($time) 
{ 
   $periods = array("second", "minute", "hour", "day", "week", "month", "year", "decade"); 
   $lengths = array("60","60","24","7","4.35","12","10"); 
   $now = time(); 
	   $difference     = $now - $time; 
	   $tense         = "ago"; 
   for($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) { 
	   $difference /= $lengths[$j]; 
   } 
   $difference = round($difference); 
   if($difference != 1) { 
	   $periods[$j].= "s"; 
   } 
   return "$difference $periods[$j] &#39;ago&#39; "; 
}

九、截取图片,代码如下:

$filename= "test.jpg"; 
list($w, $h, $type, $attr) = getimagesize($filename); 
$src_im = imagecreatefromjpeg($filename); 
$src_x = '0';   // begin x 
$src_y = '0';   // begin y 
$src_w = '100'; // width 
$src_h = '100'; // height 
$dst_x = '0';   // destination x 
$dst_y = '0';   // destination y 
$dst_im = imagecreatetruecolor($src_w, $src_h); 
$white = imagecolorallocate($dst_im, 255, 255, 255); 
imagefill($dst_im, 0, 0, $white); 
imagecopy($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h); 
header("Content-type: image/png"); 
imagepng($dst_im); 
imagedestroy($dst_im);

十、检查网站是否宕机,代码如下:

function Visit($url){ 
   $agent = "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)";$ch=curl_init(); 
   curl_setopt ($ch, CURLOPT_URL,$url ); 
   curl_setopt($ch, CURLOPT_USERAGENT, $agent); 
   curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1); 
   curl_setopt ($ch,CURLOPT_VERBOSE,false); 
   curl_setopt($ch, CURLOPT_TIMEOUT, 5); 
   curl_setopt($ch,CURLOPT_SSL_VERIFYPEER, FALSE); 
   curl_setopt($ch,CURLOPT_SSLVERSION,3); 
   curl_setopt($ch,CURLOPT_SSL_VERIFYHOST, FALSE); 
   $page=curl_exec($ch); 
   //echo curl_error($ch); 
   $httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE); 
   curl_close($ch); 
   if($httpcode>=200 && $httpcode<300) return true; 
   else return false; 
} 
if (Visit("http://www.google.com")) 
	echo "Website OK"."n"; 
else 
	echo "Website DOWN";

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