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run code in 500+ PHP versions simultaneously

@ 2022-10-11T15:02:57Z

<?php

$list = [
    [
        'name' => 'blah',
        'path' => 'A'
    ],
    [
        'name' => 'blah',
        'path' => 'AA'
    ],
    [
        'name' => 'blah',
        'path' => 'AB'
    ],
    [
        'name' => 'blah',
        'path' => 'B'
    ],
    [
        'name' => 'blah',
        'path' => 'BA'
    ],
    [
        'name' => 'blah',
        'path' => 'BAA'
    ],
];

$result = array_reduce($list, function ($a, $c) {
    $l = substr($c['path'], 0, 1);
    isset($a[$l])
        ? $a[$l]['children'][] = $c
        : $a[$l] = [
        'name' => $c['name'],
        'path' => $c['path'],
        'children' => []
    ];
    return $a;
}, []);


// to remove the letter keys, uncomment the next line
// $result = array_values($result);

var_export($result);

Output for 7.4.32, 8.1.23 - 8.1.34, 8.2.10 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.7: array ( 'A' => array ( 'name' => 'blah', 'path' => 'A', 'children' => array ( 0 => array ( 'name' => 'blah', 'path' => 'AA', ), 1 => array ( 'name' => 'blah', 'path' => 'AB', ), ), ), 'B' => array ( 'name' => 'blah', 'path' => 'B', 'children' => array ( 0 => array ( 'name' => 'blah', 'path' => 'BA', ), 1 => array ( 'name' => 'blah', 'path' => 'BAA', ), ), ), )

preferences:dark modelive previewkey bindings

77.03 ms | 914 KiB | 4 Q