Fetching json array in php

Question

I have problem with fetching json array that i send with post by android app.

PHP code :

<?php
$properties_json = json_decode($_POST['property'], true);
foreach ($properties_json->properties as $pro_element) {
   echo $pro_element->property_id . '<br/>';
   echo $pro_element->property_name . '<br/>';
   echo $pro_element->property_value . '---------';
}

JSON array that i post :

{
  "properties": [
    {
      "property_id": "654",
      "property_name": "Gender",
      "property_value": "Male"
    },
    {
      "property_id": "655",
      "property_name": "Name",
      "property_value": "Amin"
    },
    {
      "property_id": "656",
      "property_name": "Mobile",
      "property_value": "654-451-456"
    }
  ]
}

Error :

Invalid argument supplied for foreach()

enter image description here

can you use print_r($properties_json->properties)? what is output? — user2852575
– user2852575, Commented Dec 12, 2018 at 9:19
You set true in json_decode, so it's array. not object - $properties_json['properties'] — splash58
– splash58, Commented Dec 12, 2018 at 9:20
Possible duplicate of json_encode/json_decode - returns stdClass instead of Array in PHP — Mohammad
– Mohammad, Commented Dec 12, 2018 at 9:20

executable · Accepted Answer · 2018-12-12 09:32:04Z

2

json_decode($_POST['property'], true); return an array. In your code you're using it as an object. Here is the proper way :

<?php
$properties_json = json_decode($_POST['property'], true);

foreach ($properties_json['properties'] as $pro_element) {
   echo $pro_element['property_id'] . '<br/>';
   echo $pro_element['property_name'] . '<br/>';
   echo $pro_element['property_value'] . '---------';
}

EDIT:

You can check if $_POST['property'] exist and is not null.

<?php
if(isset($_POST['property'])){
    if($_POST['property'] != null and $_POST['property'] != ""){
        $properties_json = json_decode($_POST['property'], true);

        foreach ($properties_json['properties'] as $pro_element) {
            echo $pro_element['property_id'] . '<br/>';
            echo $pro_element['property_name'] . '<br/>';
            echo $pro_element['property_value'] . '---------';
        }
    }else{
        echo "POST['property'] is empty";
    }
}else{
    echo "Missing POST['property']";
}

edited Dec 12, 2018 at 9:32

answered Dec 12, 2018 at 9:23

executable

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1 Comment

DarkBee Over a year ago

You should also check that $properties_json is not NULL though

rrr · Accepted Answer · 2018-12-12 09:22:03Z

1

You reference $properties_json->properties as if it were an object, but you converted your JSON to an array by doing json_decode($_POST['property'], true); (see the documentation of json_decode)

You either need to change the true to false or do foreach ($properties_json['properties'] as $pro_element) {

answered Dec 12, 2018 at 9:22

rrr

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3 Comments

O. Hebaby Over a year ago

Invalid argument supplied for foreach()

rrr Over a year ago

Are you sure you do actually POST anything and that $_POST['property'] contains a JSON array?

rrr Over a year ago

If I execute this <?php $_POST['property'] = '{ "properties": [ { "property_id": "654", "property_name": "Gender", "property_value": "Male" } ] }'; $properties_json = json_decode($_POST['property'], false); foreach ($properties_json->properties as $pro_element) { echo $pro_element->property_id . '<br/>'; echo $pro_element->property_name . '<br/>'; echo $pro_element->property_value . '---------'; } I get the expected result: 654<br/>Gender<br/>Male---------

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