php相对路径转化成绝对路径

提取 Gregarius中的一个函数。可以把网页中的相对路径自动转化成绝对路径。

function relative_to_absolute($content, $feed_url) {
preg_match(/(http|https|ftp):///, $feed_url, $protocol);
$server_url = preg_replace("/(http|https|ftp|news):///", "", $feed_url);
$server_url = preg_replace("//.*/", "", $server_url);

if ($server_url == ) {
return $content;
}

if (isset($protocol[0])) {
$new_content = preg_replace(/href="//, href=".$protocol[0].$server_url./, $content);
$new_content = preg_replace(/src="//, src=".$protocol[0].$server_url./, $new_content);
} else {
$new_content = $content;
}
return $new_content;
}
?>