PHP error handling functions -restore_ exception_handler()

Last update on May 28 2022 12:23:24 (UTC/GMT +8 hours)

Description

PHP restore_exception_handler function is used to restore previously defined exception handler.

Version:

PHP 5.

Syntax:

restore_exception_handler( void )

Where type of restore_exception_handler is boolean.

Parameter:

This function does not have any parameter.

Return Values:

This function always returns TRUE.

Example:

<?php
 function exception_handler_1(Exception $e)
 {
 echo '[' . __FUNCTION__ . '] ' . $e->getMessage();
 }
 function exception_handler_2(Exception $e)
 {
 echo '[' . __FUNCTION__ . '] ' . $e->getMessage();
 }
set_exception_handler('exception_handler_1');
set_exception_handler('exception_handler_2');
restore_exception_handler();
throw new Exception('This triggers the first exception handler...');
?>

Previous: restore_error_handler()
Next: set_error_handler()

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