PHP issues appending to json file, code results in an array full of null

Question

I'm trying to append new items to the end of my json file. When the code runs as below, it keeps appending null instead of the new items. I've searched around and haven't found any solutions yet.

Here's the PHP:

$_POST["carMake"] = 'toyota'; 
$_POST["startProduction"] = '258147369';
$_POST["endProduction"] = '369258147';

$file = "cars.json";
$jsonArray = json_decode(file_get_contents($file), true);
array_push($jsonArray[], array( 'Make' => $_POST["carMake"], 'Start Prod' => $_POST["startProduction"], 'End Prod' => $_POST["endProduction"] ));
file_put_contents($file, json_encode($jsonArray));

$answer = array ( 'Created' => "true", 'validation' => "Car added");
return json_encode($answer);

The intended output is:

    [
     {
      "Make":"Toyota",
      "Start Prod":258147369,
      "End Prod":369147258
     },
     {
      "Make":"BMW",
      "start":789456123,
      "end":159487263
     },
    ]

WizKid · Accepted Answer · 2014-05-10 06:10:06Z

1

array_push($jsonArray[], ... is wrong. You should either do:

$jsonArray[] = ...

or:

array_push($jsonArray, ...

not both.

answered May 10, 2014 at 6:10

WizKid

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1 Comment

user2238415 Over a year ago

That worked perfectly. I didnt see that restriction in the documentation. Thank you for the tip!

Sina R. · Accepted Answer · 2014-05-10 06:11:37Z

0

Try this as PHP manual said that. http://www.php.net/manual/en/function.array-push.php

$_POST["carMake"] = 'toyota'; 
$_POST["startProduction"] = '258147369';
$_POST["endProduction"] = '369258147';

$file = "cars.json";
$jsonArray = json_decode(file_get_contents($file), true);
$jsonArray[]= array( 'Make' => $_POST["carMake"], 'Start Prod' => $_POST["startProduction"], 'End Prod' => $_POST["endProduction"] );
file_put_contents($file, json_encode($jsonArray));

$answer = array ( 'Created' => "true", 'validation' => "Car added");
return json_encode($answer);

answered May 10, 2014 at 6:11

Sina R.

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2 Comments

user2238415 Over a year ago

Tried this as well and it worked too. Thank you for the quick response!

Sina R. Over a year ago

@user2238415 - please search this on documentation page to add one element to the array it's better to use

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