10個超有用的PHP程式碼片段（建議收藏）

本文主要介紹了10個超級有用值得收藏的PHP程式碼片段，本文講解了黑名單過濾、隨機顏色產生器、從網路下載檔案、強制下載檔案、透過Email顯示用戶的Gravatar頭像等內容，​​需要的朋友可以參考下。

儘管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程式語言。 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。

網路上有人總結幾種程式語言的特點，我覺得也挺有道理的：

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，網路上總結出了很多實用的PHP程式碼片段，這些程式碼片段在當你遇到類似的問題時，貼過去就可以使用，非常的高效，非常的省時省力。將這些程式設計師前輩總結的優秀程式碼放到自己的知識庫中，是個善於學習的程式設計師的好習慣。

一、黑名單過濾

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、隨機顏色產生器

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、從網絡下載檔案

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

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;~<p class="data (down|up)"><img.+?>(.+?) </p>~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、強制下載檔案

$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、透過Email顯示用戶的Gravatar頭像

$gravatar_link = 'http://www.gravatar.com/avatar/' . md5($comment_author_email) . '?s=32';
  echo &#39;<img src="&#39; . $gravatar_link . &#39;" />&#39;;

#七、透過cURL取得RSS訂閱數

$ch = curl_init();
curl_setopt($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);

#c、時間差異計算函數

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、裁切圖片

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

C、檢查網站是否宕機

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";

推薦學習：php影片教學

#

以上是10個超有用的PHP程式碼片段（建議收藏）的詳細內容。更多資訊請關注PHP中文網其他相關文章！