PHP中preg_match_all函数正则匹配详解-php教程

preg_match_all函数是用来获取指定数据内容的,它经常用于执行正则表达多,下面我来给大家介绍两个关于preg_match_all函数实现,一个是获取url参数,一个是获取内容中图片方法.

preg_match_all — 执行一个全局正则表达式匹配

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

例,代码如下:

<?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";
?>

如何获取伪静态url中的参数变量,已经对应的值,比如说,你现在url的是这样的,/js/d1b3cid419299191rs好脚本.

你的.htaccess文件会这样写rewirte规则 RewriteRule ^js/(.*)$ /index.php?m=Sell&a=index&g=$1 [QSA,PT,L]

这样你就可以把g接收过来,代码如下:

$get = 'd1b3cid419299191rs好脚本';
$rs_pos = strpos($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]}))
{//开源代码phpfensi.com
echo $m[1][$i].'='.${$m[1][$i]};
echo '<br>';
}
}
}
//结果:keywords=好脚本,d=1,b=3,cid=419299191

匹配文章中的图片,代码如下:

<?php
$con = file_get_contents("http://www.phpfensi.com/");
$pattern="/<[img|IMG].*?src=['|"](.*?(?:[.gif|.jpg|.png]))['|"].*?[/]?>/";
preg_match_all($pattern,$con,$match);
print_r($match);
?>
输出代码
Array
(
[0] => Array
(
[0] => <img src="http://www.phpfensi.com/usr/themes/dddefault/images/logo.png" alt="" />
[1] => <img title="" src="http://www.phpfensi.com/usr/uploads/2012/09/531656480.jpg" alt="2" />
[2] => <img src="http://www.phpfensi.com/usr/uploads/2012/09/2647136297.jpg" alt="875EA1C00E50B4542797E24FA6E7E1F2.jpg" />
)//开源代码phpfensi.com
[1] => Array
(
[0] => http://www.phpfensi.com/usr/themes/dddefault/images/logo.png
[1] => http://www.phpfensi.com/usr/uploads/2012/09/531656480.jpg
[2] => http://www.phpfensi.com/usr/uploads/2012/09/2647136297.jpg
)
)

PHP中preg_match_all函数正则匹配详解

相关推荐