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10个超级有用值得收藏的PHP代码片段

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：

复制代码 代码如下:

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，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

复制代码 代码如下:

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
复制代码 代码如下:

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、从网络下载文件
复制代码 代码如下:

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

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

复制代码 代码如下:

$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、通过Email显示用户的Gravatar头像
复制代码 代码如下:

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

七、通过cURL获取RSS订阅数
复制代码 代码如下:

$ch = curl_init();
curl_setopt($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、时间差异计算函数
复制代码 代码如下:

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、裁剪图片
复制代码 代码如下:

$filename= "test.jpg";
list($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、检查网站是否宕机
复制代码 代码如下:

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";