10个超级有用、必须收藏的PHP代码样例

　　作为一个正常的程序员，会好几种语言是十分正常的，相信大部分程序员也都会编写几句PHP程序，如果是WEB程序员，PHP一定是必备的，即使你没用它开发过大型软件项目，也一定多少了解它的语法。

　　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

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functionis_spam($text,$file,$split= ':',$regex= false){

    $handle= fopen($file,'rb');

    $contents= fread($handle,filesize($file));

    fclose($handle);

    $lines= explode("n",$contents);

    $arr= array();

    foreach($linesas $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])

                returntrue;

        }

    }

    returnfalse;

}

 

$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:3dog:3cat:2monkey:2

　二、随机颜色生成器

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functionrandomColor() {

    $str= '#';

    for($i= 0 ; $i< 6 ; $i++) {

        $randNum= rand(0 , 15);

        switch($randNum) {

            case10: $randNum= 'A';break;

            case11: $randNum= 'B';break;

            case12: $randNum= 'C';break;

            case13: $randNum= 'D';break;

            case14: $randNum= 'E';break;

            case15: $randNum= 'F';break;

        }

        $str.= $randNum;

    }

    return$str;

}

$color= randomColor();

　三、从网络下载文件

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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

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functionpage_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('~<div class="data (down|up)"><img.+?>(.+?) </div>~im',$content,$matches)){

                return$matches[2];

            }else{

                returnFALSE;

            }

        break;

        case'google':

            $rank= explode(':',$content);

            if($rank[2] != '')

                return$rank[2];

            else

                returnFALSE;

        break;

        default:

            returnFALSE;

        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

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$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

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

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

　七、通过cURL获取RSS订阅数

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$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

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functionago($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

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$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

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functionVisit($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)returntrue;

       elsereturn false;

}

if(Visit("http://www.google.com"))

       echo"Website OK"."n";

else

       echo"Website DOWN";