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PHP error handling function set_exception_handler()

Description 

PHP set_exception_handler() calls a user-defined function as parameter for exception handling.

Version:

PHP 5

Syntax:

set_exception_handler (user-defined-function)

Parameter:

Parameters Description Required / Optional Type
user-defined-function A user defined function. Required callback

Return Values:

The function returns the name of the user-defined exception handler or NULL on error.

If no previous exception handler was defined, then also NULL is returned.

Example:

 <?php 
function w3r_exception_handler($w3r_exception) 
{   echo "Uncaught exception: " , 
$exception->getMessage(), 
"\n"; } 
set_exception_handler('w3r_exception'); 
throw new Exception('Uncaught Exception'); 
echo "Not Executed\n"; 
?>

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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