php 相对路径转成绝对路径的简单示例

对PHP相对路径转换成绝对路径感兴趣的小伙伴，下面一起跟随编程之家 jb51.cc的小编两巴掌来看看吧！

<? 
/**
 * PHP相对路径转换成绝对路径
 *
 * @param 
 * @author 编程之家 jb51.cc jb51.cc
 **/
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;  
} 


/***   来自编程之家 jb51.cc（jb51.cc）   ***/