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

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(\'~<div class="data (down|up)"><img.+?>(.+?) </div>~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";