Fetching json array in php - 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

Answer 1

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']";
}

Answer 2

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) {