10个超级有用、必须收藏的PHP代码样例

时间：2022-01-22 06:12:07

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。虽然很多内容还不是太理解，不过先收集整理出来。

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";
 

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