Online PHP editor | output for QjNg7

@ 2021-02-02T04:10:55Z

<?php

$arr = [
    ['a' => 'a', 'int' => 10],
    ['a' => 'foo', 'int' => 5],
    ['a' => 'bar', 'int' => 12]
];

usort($arr, function($a, $b) { return $a['int'] <=> $b['int']; });
var_export($arr);

echo "\n---\n";

$arr = [
    ['a' => 'a', 'int' => 10],
    ['a' => 'foo', 'int' => 5],
    ['a' => 'bar', 'int' => 12]
];

usort($arr, fn($a, $b) => $a['int'] <=> $b['int']);
var_export($arr);

echo "\n---\n";

$arr = [
    ['a' => 'a', 'int' => 10],
    ['a' => 'foo', 'int' => 5],
    ['a' => 'bar', 'int' => 5]
];

usort($arr, fn($a, $b) => [$a['int'], $a['a']] <=> [$b['int'], $b['a']]);
var_export($arr);

Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: array ( 0 => array ( 'a' => 'foo', 'int' => 5, ), 1 => array ( 'a' => 'a', 'int' => 10, ), 2 => array ( 'a' => 'bar', 'int' => 12, ), ) --- array ( 0 => array ( 'a' => 'foo', 'int' => 5, ), 1 => array ( 'a' => 'a', 'int' => 10, ), 2 => array ( 'a' => 'bar', 'int' => 12, ), ) --- array ( 0 => array ( 'a' => 'bar', 'int' => 5, ), 1 => array ( 'a' => 'foo', 'int' => 5, ), 2 => array ( 'a' => 'a', 'int' => 10, ), )
Output for 7.3.0 - 7.3.33: Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW), expecting ')' in /in/QjNg7 on line 20
Process exited with code 255.

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