我想从一个JavaScript执行一个PHP脚本（基本上是更新一个SQL数据库）。

我读了一些东西，但并不成功。

我尝试了，但它看起来总是执行arrr.length的值。

脚本

$(document).ready(function(){   
        $("#submitcode").on("click", function(){
            if (document.getElementById('VT').value ==0  ||  document.getElementById('VE').value ==0  || document.getElementById('VS').value ==0){
            $("#output").text("Cannot Start experiment with at least one empty volume !");
            }
            else  {
            ocpu.seturl("https://public.opencpu.org/ocpu/library/base/R")
            //arguments
            var mysnippet = new ocpu.Snippet("V_T <- "+document.getElementById('VT').value+" \r"+"V_E <- "+document.getElementById('VE').value+" \r"+"V_S <- "+document.getElementById('VS').value+" \r"+$('#input2').val());
            //perform the request
            var req = ocpu.call("identity", {
                "x" : mysnippet
            }, function(session){
                session.getObject(function(dataR) {
                arrR = JSON.parse(dataR);
                if (arrR.length > 0){
                $("#output").text("Experiment just started");
 // this is where I would like to launch and execute the PHP file when submitcode is clicked and arrR.length > 0
 // this is where I would like to launch and execute the PHP file when submitcode is clicked and arrR.length > 0
 // this is where I would like to launch and execute the PHP file when submitcode is clicked and arrR.length > 0
                }
                });
            });
            }
        }) 
        });    

要执行的PHP

<?php
include_once '../admin/admin-class.php';
$admin = new itg_admin();
$admin->_authenticate();

            include '../db/db_simple.php';
            $idTP = $admin->get_id();
            mysql_query("UPDATE `userTP` SET `inprogress` = '1', `launchedat` = now() WHERE `userTP`.`id` =".$idTP); 
            mysql_close($connection);
        ?>