Can't process json array from Ajax in php

Question

After a lot of searches in Stackoverflow and elsewhere I can't get my array of Json objects in php.

my javascript file : src.js

var jq = jQuery.noConflict();
var jarray = [{"key":0,"keysdata":1},{"key":1,"keysdata":2}];
//json objects-array

function doAjaxRequest(jarray){
jq.ajax({
url: "test.php",
type: "post",
data: {out : JSON.stringify(jarray)},
success: function(response) {
alert(response);
alert("Ajax Transmitted successfully");
}           
});  
}

My php file :test.php

<!doctype html>
<html>
<head><title>In php from ajax</title></head>
<body>
<?php
if (isset($_POST['out'])) {
$objs = json_decode($_POST['out']);
echo 'K0=' . $objs[0]->key . ', data0=' . $objs[0]->keysdata;
}
else{
echo 'out not posted';
}
?>
</body></html>

Every thing works fine upto here. My alert(response) in the success function shows

<!doctype html>
<html>
<head>
<title>In php from ajax</title>
</head>
<body>
k0=0,  data0=1</body>
</html>

But if I access my test.php in the browser's (chrome) url box as localhost/test.php then I find the output as

out not posted

Can anybody please explain what's going on here? My intention is to carryout some processing on the array elements in the PHP side and to create a form dynamically using php (in the page test.php) to help user edit the data values (viz., 1 and 2) and the browser url would appear as localhost/test.php. I even can't find the size of the array $objs by writing $size = count($objs); var-dump($objs) shows Array (size=0).

Waiting to appreciate your proper inputs on this issue.

Rory McCrossan · Accepted Answer · 2017-05-16 16:13:02Z

2

It's because when you access a page in the browser the request is sent through a GET HTTP verb.

Your PHP code is set to only detect data sent via the POST verb - as witnessed by your use of $_POST['out'] - hence execution of the script follows the alternate logical path where you only echo out not posted to the output.

answered May 16, 2017 at 16:13

Rory McCrossan

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4 Comments

DevelopD Over a year ago

Thanks Rory for your valuable response. Do you mean if I manually acces the php then the request is treated as GET. Does the same happens when the php page is programmatically acceessed by jquery ajax? Can you please throw some light on the remaining part of the problem.

Rory McCrossan Over a year ago

The rest of your question is not very clear at all. You can change your logic to look for both $_GET['out'] and $_POST['out'] but cases where you need to use both in a single action are very rare and normally indicate that the structure of the site needs to be corrected

DevelopD Over a year ago

Hi Rory, just now I tested by setting type="get" in my ajax request.My alert show "2" perhaps the size of the array (I haven't used count($objs as yet). Also if I manually access test.php I get the same output as before.

DevelopD Over a year ago

I think I should stick to post method as I'm sending array, that too of json objects.

pendo · Accepted Answer · 2017-05-16 17:08:34Z

0

To test it directly from the php page, you need to pass it the data, because you're passing an array of objects, it would be pretty messy to do that via the url. Try this in php file.

http://localhost/test.php?testmode

<!doctype html>
<html>
<head><title>In php from ajax</title></head>
<body>
<?php
if (isset($_POST['out'])) {
    $objs = json_decode($_POST['out']);
    echo 'K0=' . $objs[0]->key . ', data0=' . $objs[0]->keysdata;
} elseif(isset($_GET['testmode'])) {
      $str = '[{"key":0,"keysdata":1},{"key":1,"keysdata":2}]';
      $objs = json_decode($str);
      echo 'K0=' . $objs[0]->key . ', data0=' . $objs[0]->keysdata;
} else {
    echo 'out not posted';
}
?>
</body></html>

To create an array of objects in PHP do the following:

$myArray = array((object)array("key" => 0,"keysdata" => 1),(object)array("key" => 1, "keysdata" => 2));

edited May 16, 2017 at 17:08

answered May 16, 2017 at 16:21

pendo

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2 Comments

DevelopD Over a year ago

Great suggestion ! it worked. But I need to get the array of objects from some other page, so I'm wondering how can I create the array manually in my php?

DevelopD Over a year ago

Also, due to complex nature of shared data I am forced to use POST.

DevelopD · Accepted Answer · 2017-05-21 09:54:30Z

Friends, this is with reference to my questions posted here on 14 and 16th May 2017. The questions are respectively: 1. Array of JSON objects successfully sent to php using jquery ajax but php reports array size=0

Can't process json array from Ajax in php

I have been working on the issue since 12th May 2017 and in a week's time thankfully after thoroughly introspecting my codes etc. I got the problem and the solution as well. I though I should share the story with people, so anybody in a situation like mine can help themselves.

When I run my page containing jquery, everything works fine. But if I access the target php manually, I have been constantly getting the unknown index "out" in my target php file ......... on line .....

I had been wondering why PHP not getting the value of "out" despite chrome debugging and all alerts in JQuery file working perfectly to reveal that the data transmission to and from PHP is OK.

After a lot of reviews, I finally could discover that PHP requires "out" to be posted from a form via an element with the name "out".

I then revised my code in the Jquery page to store the Json array "jarrary" after stringify-ing to a hidden textbox element with the name "out" (using jquery coding). Then I made the form post through Jquery submit() method. And the things worked ! Now if I manually access the PHP page I get that both the PHP side and JQuery side are working fine.

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