php获取超链接文本内容的几款正则表达式

preg_match_all('/<a[dd]*>check user</a>/i',$string,$matches);

print_r($matches[0]);

preg_match_all('/<a[^>]*>[^<]*</a>/i',$string,$matches);

print_r($matches[0]);

preg_match_all('/<a.+?>check user</a>/is',$str,$arr);

session_write_close();

$pageurl = "http://www.111cn.net/index.html";
curl_setopt($ch, curlopt_returntransfer, 1);
curl_setopt ($ch, curlopt_url, $pageurl );
$html = curl_exec ( $ch );
curl_close($ch);

//then you need to fix pathing to absolute
$search = "/(src|href|background)="[^:,^>,^"]*"/i";

preg_match_all ( $search, $html, $a_matches );

$file = fopen("http://www.111cn.net/","r"); //读取远程文件

$file = fopen("a.txt","r");//读取本地文件

$aid  = isset( $_GET['aid'] )?$_GET['aid']:'';
$t = isset( $_GET['t'] )?$_GET['t']:'';
if( intval( $aid ) )
{
 if( $t =='show' )
 {
  echo "document.write('120');";
 }
 else
 {
  $conn = mysql教程_connect('www.111cn.net','root','root') ;  
  $sql = "Update test set click_num = click_num+1 where aid ='$aid'";
  mysql_db_query('db',$sql,$conn);
 }
}

?>

function getRelativePath($a, $b) {  
    $returnPath = array(dirname($b));  
    $arrA = explode('/', $a);  
    $arrB = explode('/', $returnPath[0]);

    for ($n = 1, $len = count($arrB); $n < $len; $n++) {  
        if ($arrA[$n] != $arrB[$n]) {  
            break;  
        }   
    }  
    if ($len - $n > 0) {  
        $returnPath = array_merge($returnPath, array_fill(1, $len - $n, '..'));  
    }  
      
    $returnPath = array_merge($returnPath, array_slice($arrA, $n));  
    return implode('/', $returnPath);  
}  
var_dump(getRelativePath($a, $b)); 

//方法二
$a = "/a/b/c/d/index.php";
//echo basename($a,'.php');// 返回路径中文件名部分
//echo dirname($a);
$b = "/a/b/12/34/index2.php";

function getRelativePath($path1,$path2){
    $p1 = dirname($path1);
    $p2 = dirname($path2);

    $arr1 = explode('/',$p1);
    $arr2 = explode('/',$p2);

    $diff_arr= array_diff($arr2,$arr1);    //计算差集 注意这里 是谁相对谁的
    $inter_arr = array_intersect($arr1,$arr2);//计算交集
   
    $leng = count($inter_arr);    //长度是以交集的为准 即求..部分
    for($i=1;$i<$leng;$i++){
        $inter_arr[$i] = '..';   
    }
   
    $merge_arr = array_merge($inter_arr,$diff_arr);
    $fina_arr = implode('/',$merge_arr);
    return $fina_arr;
}
var_dump(getRelativePath($a,$b));
//返回 string '/../../12/34' (length=12)
//如果改成$diff_arr= array_diff($arr1,$arr2); 就返回string '/../../c/d (length=12)