PHP Array Exercises : Decodes a JSON string

Last update on May 30 2022 11:45:42 (UTC/GMT +8 hours)

PHP Array: Exercise-6 with Solution

Write a PHP script which decodes the following JSON string.

Sample JSON code :
{"Title": "The Cuckoos Calling",
"Author": "Robert Galbraith",
"Detail": {
"Publisher": "Little Brown"
}}

Sample Solution:

PHP Code:

<?php
function w3rfunction($value,$key)
{
echo "$key : $value"."\n";
}
$a = '{"Title": "The Cuckoos Calling",
"Author": "Robert Galbraith",
"Detail":
{ 
"Publisher": "Little Brown"
 }
  }';
$j1 = json_decode($a,true);
array_walk_recursive($j1,"w3rfunction");
?>

Sample Output:

Title : The Cuckoos Calling                                 
Author : Robert Galbraith                                   
Publisher : Little Brown

Flowchart:

PHP Code Editor:

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Previous: Write a PHP script to get the first element of the specified array.
Next: Write a PHP script that inserts a new item in an array in any position.

What is the difficulty level of this exercise?

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PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC