php js 截取指定的字符串 获取当前的连接地址

1.php

function dealWithId() {

//淘宝的连接url：
    $url = "https://item.taobao.com/item.htm?spm=a1z10.1-c.w5003-13051644504.7.9UkGEJ&id=523811160821&scene=taobao_shop";
    $third_id = 0;

//获取指定字符的位置：
    $n = strpos($url, 'id=');
    $m = $n + 3;

从$m开始截取12位长的字符

    $url = substr($url, $m, 12);
    $third_id = intval($url);  
    return $third_id;
}

2.js

//获取topic的url
function getTopicUrl(){
//获取当前网页的连接地址url

var url = window.location.href;
//截取url的id    
 return getTopicId(url);     
}

//截取id：
function getTopicId(url){

//截取后十位字符
return url.substr(url.length-10);
}