Installing and configuring PHP Variable Handling Functions
Description
In this page, we will discuss installing and configuring PHP Variable Handling functions.
Requirements:
PHP Variable Handling functions do not require any external library files.
Installation:
Since PHP Variable Handling functions are part of the PHP core, they don't require any installation.
Runtime Configuration:
You don't need to add any directive in php.ini for running PHP Variable Handling functions.
Resource Types:
PHP Variable Handling functions have no defined resource types.
Predefined constants:
In the following table, we have given a list of constants which are part of the PHP core.
PHP Variable Handling function has no constants defined.
See also
Previous: wordwrap
Next: debug_zval_dump
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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