截取两个字符串之间的字符串

//在一个字符串中返回两个字符串之间的字符串
function getNeedBetween($kw1,$mark1,$mark2)
{
$kw=$kw1;
$kw='123'.$kw.'123';
$st =stripos($kw,$mark1);
$ed =stripos($kw,$mark2);
if(($st==false||$ed==false)||$st>=$ed)
return 0;
$kw=substr($kw,($st+7),($ed-$st-7));
return $kw;
}
//处理字符串
function fileGet($url,$i=0)
{
//控制不发生死循环
$i++;
if($i > 5) return;
//获取数据
$str = file_get_contents($url);
//检测特殊字符串是否存在
if(strstr($str,'<title>'))
{
return getNeedBetween($str,'<title>','</title>');
}else{
//递归调用
fileGet($url,$i);
}
}
$url = "http://lusongsong.com/reed/10190.html";
$str = fileGet($url);