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    10个超级有用的PHP代码片段(建议收藏)

    醉折花枝作酒筹醉折花枝作酒筹2021-07-21 18:02:23转载147
    本文主要介绍了10个超级有用值得收藏的PHP代码片段,本文讲解了黑名单过滤、随机颜色生成器、从网络下载文件、强制下载文件、通过Email显示用户的Gravatar头像等内容,需要的朋友可以参考下。

    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:

    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

    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

    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

    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('~<p class="data (down|up)"><img.+?>(.+?) </p>~im',$content,$matches)){ 
                    return $matches[2]; 
                }else{ 
                    return FALSE; 
                } 
            break; 
            case 'google': 
                $rank = explode(':',$content); 
                if($rank[2] != '') 
                    return $rank[2]; 
                else 
                    return FALSE; 
            break; 
            default: 
                return FALSE; 
            break; 
        } 
    } 
    // Alexa Page Rank: 
    echo 'Alexa Rank: '.page_rank('techug.com'); 
    echo '
    '; 
    // Google Page Rank 
    echo 'Google Rank: '.page_rank('techug.com', 'google');

    五、强制下载文件

    $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

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

    七、通过cURL获取RSS订阅数

    $ch = curl_init();
    curl_setopt($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

    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

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

    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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