文一个正则的问题

Question

preg_match_all("/href\s*=\s*(['\"]?)(.+?)\\1/i",$str,$arr);
print_r($arr[2]); 
不知道为什么要加 PREG_SET_ORDER 属性,把结果聚在一起不是更容易处理吗?

Answer 1

preg_match_all("/href\s*=\s*(['\"]?)(.+?)\\1/i",$str,$arr); 
print_r($arr[2]); 
这个好像也不行，输出如下：
Array
(
    [0] => Array
        (
            [0] => href=h
            [1] => href=h
            [2] => href=h
            [3] => href=h
            [4] => href=h
            [5] => href=h
            [6] => href="http://passport.baidu.com/?login&tpl=mn&u='+escape(location.href)+'"
            [7] => href=h
            [8] => href=/
            [9] => href=/
            [10] => href=h
            [11] => href="http://www.hao123.com"
            [12] => href=/
            [13] => href=h
            [14] => href=h
            [15] => href=h
            [16] => href=/
            [17] => href=h
            [18] => href=h
            [19] => href=h
            [20] => href=h
        )    [1] => Array
        (
            [0] => 
            [1] => 
            [2] => 
            [3] => 
            [4] => 
            [5] => 
            [6] => "
            [7] => 
            [8] => 
            [9] => 
            [10] => 
            [11] => "
            [12] => 
            [13] => 
            [14] => 
            [15] => 
            [16] => 
            [17] => 
            [18] => 
            [19] => 
            [20] => 
        )    [2] => Array
        (
            [0] => h
            [1] => h
            [2] => h
            [3] => h
            [4] => h
            [5] => h
            [6] => http://passport.baidu.com/?login&tpl=mn&u='+escape(location.href)+'
            [7] => h
            [8] => /
            [9] => /
            [10] => h
            [11] => http://www.hao123.com
            [12] => /
            [13] => h
            [14] => h
            [15] => h
            [16] => /
            [17] => h
            [18] => h
            [19] => h
            [20] => h
        ))