PHP JSON Exercises : Display JSON decode errors

Last update on May 30 2022 11:43:47 (UTC/GMT +8 hours)

PHP JSON: Exercise-4 with Solution

Write a PHP function to display JSON decode errors.

Sample Solution:

PHP Code:

<?php
function json_error_message($json_str)
{
$json[] = $json_str;
echo $json;
foreach ($json as $string)
{
echo 'Decoding: ' . $string."\n";
json_decode($string);

switch (json_last_error())
{
case JSON_ERROR_NONE:
echo ' - No errors'."\n";
break;
case JSON_ERROR_DEPTH:
echo ' - Maximum stack depth exceeded'."\n";
break;
case JSON_ERROR_STATE_MISMATCH:
echo ' - Underflow or the modes mismatch'."\n";
break;
case JSON_ERROR_CTRL_CHAR:
echo ' - Unexpected control character found'."\n";
break;
case JSON_ERROR_SYNTAX:
echo ' - Syntax error, malformed JSON'."\n";
break;
case JSON_ERROR_UTF8:
echo ' - Malformed UTF-8 characters, possibly incorrectly encoded'."\n";
break;
default:
echo ' - Unknown error'."\n";
break;
}
}
}
json_error_message('{"color1": "Red Color"}');
?>

Sample Output:

PHP Notice:  Array to string conversion in /home/students/98837c40-6
86c-11e7-a315-21e19fc8c51e.php on line 5                            
ArrayDecoding: {"color1": "Red Color"}                              
 - No errors

Flowchart :

PHP Code Editor:

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Next: PHP Searching and Sorting Algorithm Exercises Home.

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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