Using usort() to Sort Arrays with a User-Defined Comparison Function in PHP
The article explains PHP's usort() function, detailing its purpose, parameters, return values, and providing a complete example with code and output to demonstrate how to sort an array using a custom comparison callback.
The PHP usort() function sorts the values of an array using a user‑defined comparison function, allowing custom ordering criteria.
Parameters: array &$array – the input array to be sorted; callable $cmp_function – a function that returns an integer less than, equal to, or greater than zero when the first argument is respectively less than, equal to, or greater than the second.
Return value: TRUE on success, FALSE on failure.
Example:
$value) {
echo "$key: $value\n";
}
?>Output:
0: 1
1: 2
2: 3
3: 5
4: 6Laravel Tech Community
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