PHP ArrayUndefinedOffset But Why? - php

Question

I have dataset like the following, one of my table column let say prices column store prices in json format, example given below.
<?php
$dataSet[] = array(
"product_id" => 1,
"prices" => '{"1":"29990", "2": "10000"}'
);
foreach ($dataSet as $dataRow)
{
$pricesStdClassObject = json_decode($dataRow['prices']);
// Convert stdClass Object into array
$pricesArray = (array) $pricesStdClassObject;
print_r($pricesArray);
}
?>
The output of print_r($pricesArray) is the following
Array ( [1] => 29990 [2] => 10000 )
Then why print_r($pricesArray[1]) give me error
A PHP Error was encountered
Severity: Notice
Message: Undefined offset: 1
But why?

Answer 1

And finally i found the solution:
According to the documentation here and from the forum here I found a ‘assoc’ parameter of json_decoded method that used with this method and by default its value is FLASE, json_decoded return stdClass objects if you want the returned objects converted into associative arrays then you have to make the ‘assoc’ parameter value to TRUE like the following.
$pricesStdClassObject = json_decode($dataRow['prices'], TRUE);
So the above example code will become like this
<?php
$dataSet[] = array(
"prices" => '{"1":"29990", "2": "10000"}'
);
foreach ($dataSet as $dataRow)
{
$pricesArray = json_decode($dataRow['prices'], TRUE);
// returned objects will be converted into associative arrays.
print_r($pricesArray);
}
?>
And then you can access the indexed value with no error message :)
print_r($pricesArray[1]); output: 29990
Array type casting with json decoded StdClass Objects is not working properly, you can skip the following piece of code if you are using the ‘assoc’ parameter.
// Convert stdClass Object into array
$pricesArray = (array) $pricesStdClassObject;