Learn how to sort a multidimensional array in PHP by a specific key using usort() and a custom comparison function.

PHP Code Editor

<?php
$data = [
["name" => "Alice", "age" => 34],
["name" => "Bob", "age" => 28],
["name" => "Charlie", "age" => 40]
];
// Sort by 'age' key (ascending)
usort($data, function ($a, $b) {
return $a['age'] <=> $b['age'];
});
print_r($data);
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PHP Version

Execution Result

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