How to return an array from PHP script when an HTTP request is sent from javascript?

Question

Hi I'm new to PHP and I'm stuck on an issue, I want to send a HTTP request to a PHP script and it should return a 2x2 array. But with my code I'm receiving nothing.

index.html:

<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <script>
        var xhr = new XMLHttpRequest();
        xhr.open("GET", "get_info.php");
        xhr.onload = function () {
            console.log(xhr.responseText);                    
        };
        xhr.send();
    </script>    
</body>
</html>

get_info.php:

<?php
    $return_array = [[1, "h"],[2, "he"],[3, "hel"],[4, "hell"],[5, "hello"]];
    return $return_array;
?>

Jeff · Accepted Answer · 2019-01-01 02:36:50Z

2

json_encode() that array, and echo (not return!) the resulting json string:

<?php
    $return_array = [[1, "h"],[2, "he"],[3, "hel"],[4, "hell"],[5, "hello"]];
    echo json_encode($return_array);
    // remove the trailing ?> just to make sure you don't send an unwanted newline, space or smth

Then in javascript

var myArray = JSON.parse(xhr.responseText); 
console.log(myArray);

to make a js array out of it again.

Some docs and related reads:

answered Jan 1, 2019 at 2:36

Jeff

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Comments

Michael Treanor · Accepted Answer · 2019-01-01 02:58:15Z

0

Use echo instead of return ... this isn't a function that was called; it is a code snippet that simply puts dynamic data in place of static text.

answered Jan 1, 2019 at 2:58

Michael Treanor

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