PHP发起get post put delete请求

<?php
class commonFunction{
    function callInterfaceCommon($URL,$type,$params,$headers){
        $ch = curl_init();
        $timeout = 5;
        curl_setopt ($ch, CURLOPT_URL, $URL); //发贴地址
        if($headers!=""){
            curl_setopt ($ch, CURLOPT_HTTPHEADER, $headers);
        }else {
            curl_setopt ($ch, CURLOPT_HTTPHEADER, array(‘Content-type: text/json‘));
        }
        curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
        switch ($type){
            case "GET" : curl_setopt($ch, CURLOPT_HTTPGET, true);break;
            case "POST": curl_setopt($ch, CURLOPT_POST,true);
                         curl_setopt($ch, CURLOPT_POSTFIELDS,$params);break;
            case "PUT" : curl_setopt ($ch, CURLOPT_CUSTOMREQUEST, "PUT");
                         curl_setopt($ch, CURLOPT_POSTFIELDS,$params);break;
            case "DELETE":curl_setopt ($ch, CURLOPT_CUSTOMREQUEST, "DELETE");
                          curl_setopt($ch, CURLOPT_POSTFIELDS,$params);break;
        }
        $file_contents = curl_exec($ch);//获得返回值
        return $file_contents;
        curl_close($ch);
    }
}