如何从javascript发送的PHP中接收数据[重复]

Question

This question already has an answer here:

• Reference - What does this error mean in PHP? 34 answers

I am sending some data from my pain page to app.php using javascript

$(document).on('click', '.app' , function(){
        var data=$(this).attr("id");
        window.location="application/app.php?data="+data;   //data send in this statement
    });

my php code is this :

<?php
if($_GET['data'])
{
    echo $app_id=$_GET["data"]; receiving data 

}
?>

It works sometime but now it is giving Notice in an alert box: Undefined index data in app.php. But it is showing the echo.

---

I want to know how I can receive the data I need using $_POST or $_GET. like we receive by making an Ajax call. But I haven't specified something like this in Javascript. is there any way to this?

I want to clarify that the data exists and it is non empty because echo is successfully printing that on the page

</div>

Answer 1

Try this:

<?php
if(!empty($_GET['data']))
{
    $app_id = $_GET['data']; // receiving data 
}
?>

Please be aware that passing data without validation is not secure. Reccomended reading: https://www.owasp.org/index.php/Category:OWASP_Top_Ten_Project