PHP error handling function trigger_error()
Description
PHP function trigger_error() generates a user-level error or warning or notice.
The function can be used either along with the built-in error handler or with a user defined function which is set as the new error handler (set_error_handler()).
If you want to generate a specific response to an exception at runtime, using this function is useful.
Version:
PHP 4 >= 4.0.1, PHP 5.
Syntax:
trigger_error (error_msg, error_type )
Parameter:
Parameters | Description | Required / Optional | Type |
---|---|---|---|
error_msg | A string which will be displayed as an error message. | Required | string |
error_type | Specifies the error type for an error message. Values may be - 1. E_USER_ERROR. 2. E_USER_WARNING. 3. E_USER_NOTICE. |
Optional | integer |
Return Values:
The function returns FALSE if the wrong error_type is specified. Otherwise, it returns TRUE.
Example:
<?php
$a = 12;
$b = 5;
if($a%$b == 0)
trigger_error("This is an error",E_USER_NOTICE );
?>
Previous: set_exception_handler()
Next: user_error()
PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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
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