10个超级有用值得收藏的PHP代码片段

尽管PHP经常被人诟病，被人贬低，被人当玩笑开，事实证明，PHP是全世界网站开发中使用率最高的编程语言。PHP最大的缺点是太简单，语法不严谨，框架体系很弱，但这也是它最大的优点，一个有点编程背景的普通人，只需要学习PHP半天时间，就可以上手开始开发web应用了。

网上有人总结几种编程语言的特点，我觉得也挺有道理的：

复制代码代码如下:

	
	PHP 就是： Quick and Dirty

	Java 就是： Beauty and Slowly

	Ruby 就是： Quick and Beauty

	python 就是： Quick and Simple

在PHP的流行普及中，网上总结出了很多实用的PHP代码片段，这些代码片段在当你遇到类似的问题时，粘贴过去就可以使用，非常的高效，非常的省时省力。将这些程序员前辈总结出的优秀代码放到自己的知识库中，是一个善于学习的程序员的好习惯。

一、黑名单过滤

复制代码代码如下:

$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

复制代码代码如下:

	
	function randomColor() {

	    $str = '#';

	    for($i = 0 ; $i < 6 ; $i++) {

	        $randNum = rand(0 , 15);

	        switch ($randNum) {

	            case 10: $randNum = 'A'; break;

	            case 11: $randNum = 'B'; break;

	            case 12: $randNum = 'C'; break;

	            case 13: $randNum = 'D'; break;

	            case 14: $randNum = 'E'; break;

	            case 15: $randNum = 'F'; break;

	        }

	        $str .= $randNum;

	    }

	    return $str;

	}

	$color = randomColor();

三、从网络下载文件

复制代码代码如下:

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

五、强制下载文件

复制代码代码如下:

$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、通过Email显示用户的Gravatar头像

复制代码代码如下:

	
	 $gravatar_link = 'http://www.gravatar.com/avatar/' . md5($comment_author_email) . '?s=32';

	  echo '<img src="' . $gravatar_link . '" />';

七、通过cURL获取RSS订阅数

复制代码代码如下:

	
	$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、时间差异计算函数

复制代码代码如下:

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] 'ago' ";
}

九、裁剪图片

复制代码代码如下:

$filename= "test.jpg";
list($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

复制代码代码如下:

	
	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";

10个超级有用值得收藏的PHP代码片段

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