值得收藏的10个PHP代码样例(黑名单＼下载文件)

一、黑名单过滤,代码如下:

function is_spam($text, $file, $split = &＃39;:&＃39;, $regex = false){  
	$handle = fopen($file, &＃39;rb&＃39;);  
	$cOntents= fread($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)] = $count;  
	}  
	preg_match_all("~".implode(&＃39;|&＃39;, array_keys($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 = &＃39;spam.txt&＃39;;  
$str = &＃39;This string has cat, dog word&＃39;;  
if(is_spam($str, $file))  
	echo &＃39;this is spam&＃39;;  
else  
	echo &＃39;this is not spam&＃39;; 
ab:3 
dog:3 
cat:2 
monkey:2

二、随机颜色生成器,代码如下:

function randomColor() {  
	$str = &＃39;#&＃39;;  
	for($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 = &＃39;http://somsite.com/some_video.flv&＃39;;  
$pi = pathinfo($url);  
$ext = $pi[&＃39;extension&＃39;];  
$name = $pi[&＃39;filename&＃39;]; 
// 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 = $name.&＃39;.&＃39;.$ext;  
if(preg_match("/[^0-9a-z._-]/i", $saveFile))  
	$saveFile = md5(microtime(true)).&＃39;.&＃39;.$ext; 
$handle = fopen($saveFile, &＃39;wb&＃39;);  
fwrite($handle, $opt);  
fclose($handle);

四、Alexa/Google Page Rank,代码如下:

function page_rank($page, $type = &＃39;alexa&＃39;){  
	switch($type){  
		case &＃39;alexa&＃39;:  
			$url = &＃39;http://alexa.com/siteinfo/&＃39;;  
			$handle = fopen($url.$page, &＃39;r&＃39;);  
		break;  
		case &＃39;google&＃39;:  
			$url = &＃39;http://google.com/search?client=navclient-auto&ch=6-1484155081&features=Rank&q=info:&＃39;;  
			$handle = fopen($url.&＃39;http://&＃39;.$page, &＃39;r&＃39;);  
		break;  
	}  
	$cOntent= stream_get_contents($handle);  
	fclose($handle);  
	$cOntent= preg_replace("~(n|t|ss+)~",&＃39;&＃39;, $content);  
	switch($type){  
		case &＃39;alexa&＃39;:  
			if(preg_match(&＃39;~
(.+?) 
~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[&＃39;file&＃39;]; //Get the fileid from the URL  
// Query the file ID  
$query = sprintf("SELECT * FROM tableName WHERE id = &＃39;%s&＃39;",mysql_real_escape_string($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($row[&＃39;FileName&＃39;]).";");  
	header("Content-Transfer-Encoding: binary");  
	header("Content-Length: ".filesize($row[&＃39;FileName&＃39;])); 
	@readfile($row[&＃39;FileName&＃39;]);  
	exit(0);  
}else{  
	header("Location: /");  
	exit;  
}

六、用Email显示用户的Gravator头像

$gravatar_link = &＃39;http://www.gravatar.com/avatar/&＃39; . md5($comment_author_email) . &＃39;?s=32&＃39;; 
echo &＃39;&＃39;;

七、用cURL获取RSS订阅数,代码如下:

$ch = curl_init(); 
curl_setopt($ch,CURLOPT_URL,&＃39;https://feedburner.google.com/api/awareness/1.0/GetFeedData?id=7qkrmib4r9rscbplq5qgadiiq4&＃39;); 
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1); 
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,2); 
$cOntent= curl_exec($ch); 
$subscribers = get_match(&＃39;/circulation="(.*)"/isU&＃39;,$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 
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 = &＃39;0&＃39;;   // begin x 
$src_y = &＃39;0&＃39;;   // begin y 
$src_w = &＃39;100&＃39;; // width 
$src_h = &＃39;100&＃39;; // height 
$dst_x = &＃39;0&＃39;;   // destination x 
$dst_y = &＃39;0&＃39;;   // 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";

 
本文地址：
转载随意，但请附上文章地址:-)