How to force convert json array in php

PHP is a widely used web development language. The need to convert PHP arrays into JSON objects or JSON arrays often arises. In PHP, the convenient built-in function json_encode() is used to convert PHP arrays into JSON format, but in some cases, it is necessary to force the conversion of PHP arrays into JSON arrays. Next, this article will explain how to force convert a PHP array to a JSON array in PHP.

In PHP, you can use the json_encode() function to convert a PHP array into a JSON object. The following is the sample code:

<?php
    $sampleArray = array(&#39;a&#39;=> 1, 'b'=> 2, 'c'=> 3);
    $jsonObj = json_encode($sampleArray);
    echo $jsonObj;
?>

With this code, we can get the output: {"a":1,"b":2,"c":3}. This is a JSON object, where a, b, c are keys and 1, 2, 3 are values.

However, sometimes you need to convert a PHP array into a JSON array. In PHP, a JSON array should be an array of numbers where each element is a JSON object. Here is an example of a JSON array:

[
    {"id":1,"name":"John Doe"},
    {"id":2,"name":"Jane Doe"},
    {"id":3,"name":"Bob Smith"}
]

You cannot convert a PHP array to a JSON array using just the json_encode() function because it will just be a JSON object and not an array. In order to convert a PHP array into a JSON array, we need to re-label the array keys as numbers to be incremented in the JSON array. The following is the sample code:

<?php
    $sampleArray = array(1 => array('id' => 1, 'name' => 'John Doe'),
                         2 => array('id' => 2, 'name' => 'Jane Doe'),
                         3 => array('id' => 3, 'name' => 'Bob Smith'));
    $jsonArray = json_encode(array_values($sampleArray));
    echo $jsonArray;
?>

In this code, the array_values() function will return the value part of the array element. When you pass this array directly to the json_encode() function, the function will interpret it as a JSON object. So we need to first pass it to the array_values() function to get the array values ​​and pass it to the json_encode() function to convert it to a JSON array.

When we run this code, the output is:

[
    {"id":1,"name":"John Doe"},
    {"id":2,"name":"Jane Doe"},
    {"id":3,"name":"Bob Smith"}
]

This is a perfect JSON array that matches our expected output.

To sum up, we can force the conversion of the PHP array into a JSON array by re-annotating the key values ​​​​as numbers, and use the built-in json_encode() function to convert. This method is very useful as it can easily convert PHP array to JSON array and process the data efficiently.

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