php解析字符串里所有URL地址的方法

本文实例讲述了php解析字符串里所有URL地址的方法。分享给大家供大家参考。具体如下：

 0){
    $pathi   = pathinfo($current_url);
    $dir    = $pathi["dirname"];
    $base    = parse_url($current_url);
    $split_path = explode("/", $dir);
    $url    = "";
    foreach($links as $k => $link){
      if(preg_match("/^../", $link)){
 $total = substr_count($link, "../");
 for($i = 0; $i < $total; $i++){
   array_pop($split_path);
 }
 $url = implode("/", $split_path) . "/" . str_replace("../", "", $link);
      }elseif(preg_match("/^///", $link)){
 $url = $base["scheme"] . ":" . $link;
      }elseif(preg_match("/^/|^.//", $link)){
 $url = $base["scheme"] . "://" . $base["host"] . $link;
      }elseif(preg_match("/^[a-zA-Z0-9]/", $link)){
 if(preg_match("/^http/", $link)){
   $url = $link;
 }else{
   $url    = $dir . "/" . $link;
 }
      }
      $links[$k] = $url;
    }
  }
  return $links;
}
header("content-type: text/plain");
$url = "https://www.jb51.net";
$html = file_get_contents($url);
// Gets links from the page:
print_r(pagelinks($html));
// Gets links from the page and formats them to a full valid url:
print_r(pagelinks($html, $url, true));

希望本文所述对大家的php程序设计有所帮助。