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@ 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 git.master, git.master_jit, rfc.property-hooks: 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', ), ), ), )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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