10個超級有用值得收藏的PHP代碼片段

2024-05-04 23:30:22

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這篇文章主要介紹了10個超級有用值得收藏的PHP代碼片段,本文講解了黑名單過濾、隨機顏色生成器、從網絡下載文件、強制下載文件、通過Email顯示用戶的Gravatar頭像等內容,需要的朋友可以參考下

盡管PHP經常被人詬病，被人貶低，被人當玩笑開，事實證明，PHP是全世界網站開發中使用率最高的編程語言。PHP最大的缺點是太簡單，語法不嚴謹，框架體系很弱，但這也是它最大的優點，一個有點編程背景的普通人，只需要學習PHP半天時間，就可以上手開始開發web應用了。

網上有人總結幾種編程語言的特點，我覺得也挺有道理的：

復制代碼代碼如下:

		
		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，網上總結出了很多實用的PHP代碼片段，這些代碼片段在當你遇到類似的問題時，粘貼過去就可以使用，非常的高效，非常的省時省力。將這些程序員前輩總結出的優秀代碼放到自己的知識庫中，是一個善于學習的程序員的好習慣。

一、黑名單過濾

復制代碼代碼如下:

$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、隨機顏色生成器

復制代碼代碼如下:

		
		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、從網絡下載文件

復制代碼代碼如下:

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、強制下載文件

復制代碼代碼如下:

$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、通過Email顯示用戶的Gravatar頭像

復制代碼代碼如下:

		
		 $gravatar_link = 'http://www.gravatar.com/avatar/' . md5($comment_author_email) . '?s=32';
		  echo '<img src="' . $gravatar_link . '" />';

七、通過cURL獲取RSS訂閱數

復制代碼代碼如下:

		
		$ch = curl_init();
		curl_setopt($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、時間差異計算函數

復制代碼代碼如下:

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、裁剪圖片

復制代碼代碼如下:

$filename= "test.jpg";
list($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、檢查網站是否宕機

復制代碼代碼如下:

		
		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";