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：
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PHP
// $html = the html on the page
// $current_url = the full url that the html came from
//(only needed for $repath)
// $repath = converts ../ and / and // urls to full valid urls
function pageLinks($html,$current_url = "",$repath = false){
preg_match_all("/\ 0 && strlen($current_url) > 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 = "//www.jb51.cc";
$html = file_get_contents($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。
