<?php

//获取tech和98426这两个字符串

$str = "http://info.meadin.com/tech/98426_1.shtml";

echo 

$newstr = 

substr(

$str,7,

strlen(

$str)); //info.meadin.com/tech/98426_1.shtml

$arr = 

explode('/',

$newstr);

$num = $arr[1];//tech

$user = strstr($arr[2], '_', true); //98426