PHP中preg_match_all函數正則匹配詳解

2024-09-04 11:47:35

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preg_match_all函數是用來獲取指定數據內容的,它經常用于執行正則表達多,下面我來給大家介紹兩個關于preg_match_all函數實現,一個是獲取url參數,一個是獲取內容中圖片方法.

preg_match_all — 執行一個全局正則表達式匹配

int preg_match_all ( string $pattern ,string $subject [,array &$matches [, int $flags = PREG_PATTERN_ORDER [,int $offset = 0 ]]] )

例,代碼如下:

<?php

preg_match_all("|<[^>]+>(.*)</[^>]+>|U",

"<b>example: </b><div align=left>this is a test</div>",

$out, PREG_PATTERN_ORDER);

echo $out[0][0] . ", " . $out[0][1] . "n";

echo $out[1][0] . ", " . $out[1][1] . "n";

?>

如何獲取偽靜態url中的參數變量,已經對應的值,比如說,你現在url的是這樣的,/js/d1b3cid419299191rs好腳本.

你的.htaccess文件會這樣寫rewirte規則 RewriteRule ^js/(.*)$ /index.php?m=Sell&a=index&g=$1 [QSA,PT,L]

這樣你就可以把g接收過來,代碼如下:

$get = 'd1b3cid419299191rs好腳本';

$rs_pos = strpos($get,'rs');

if($rs_pos !== false)

{

    $rs = substr($get,$rs_pos);

    $rs = str_replace('rs','',$rs);

    $rs = strpos($rs,'/')!==false ? substr($rs,0,strpos($rs,'/')) : $rs;

    $get = substr($get,0,$rs_pos);

}

echo 'keywords='.$rs;

echo '<br>';

preg_match_all('/([a-z]*)([0-9]+)/',$get,$m);

if($m)

{

        $k = $v = '';

        $count = count($m[1]);

        for($i = 0; $i <= $count; $i++)

        {

            ${$m[1][$i]} = $m[2][$i];

            if(isset(${$m[1][$i]}))

            {//開源代碼Vevb.com

                echo $m[1][$i].'='.${$m[1][$i]};

                echo '<br>';

            }

        }

}

//結果:keywords=好腳本,d=1,b=3,cid=419299191

匹配文章中的圖片,代碼如下:

<?php

$con = file_get_contents("http://www.49028c.com/");

$pattern="/<[img|IMG].*?src=['|"](.*?(?:[.gif|.jpg|.png]))['|"].*?[/]?>/";

preg_match_all($pattern,$con,$match);

print_r($match);

?>

輸出代碼

Array

(

[0] => Array

(

[0] => <img src="http://www.49028c.com/usr/themes/dddefault/images/logo.png" alt="" />

[1] => <img style="display: block; margin-left: auto; margin-right: auto;" title="" src="http://www.49028c.com/usr/uploads/2012/09/531656480.jpg" alt="2" />

[2] => <img style="display: block; margin-left: auto; margin-right: auto;" src="http://www.49028c.com/usr/uploads/2012/09/2647136297.jpg" alt="875EA1C00E50B4542797E24FA6E7E1F2.jpg" />

)//開源代碼Vevb.com

[1] => Array

(

[0] => http://www.49028c.com/usr/themes/dddefault/images/logo.png

[1] => http://www.49028c.com/usr/uploads/2012/09/531656480.jpg

[2] => http://www.49028c.com/usr/uploads/2012/09/2647136297.jpg

)

)