Online PHP editor | output for 8JjjS

@ 2018-01-15T14:57:25Z

<?php

$input = [
    ['key'=>'x', 'value'=>'a'],
    ['key'=>'x', 'value'=>'b'],
    ['key'=>'x', 'value'=>'c'],
    ['key'=>'y', 'value'=>'d'],
    ['key'=>'y', 'value'=>'e'],
    ['key'=>'z', 'value'=>'f'],
    ['key'=>'m', 'value'=>'n'],
];

$reducer = function($carry, $item) {
    $carry[$item['key']][] = $item['value'];
    
    return $carry;
};

$mapper = function ($item) {
    if (count($item) === 1) {
        return $item[0];
    }
    
    return $item;
};

$output = array_map($mapper, array_reduce($input, $reducer, []));

var_dump($output);

Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.4.16, 8.5.0 - 8.5.1: array(4) { ["x"]=> array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" } ["y"]=> array(2) { [0]=> string(1) "d" [1]=> string(1) "e" } ["z"]=> string(1) "f" ["m"]=> string(1) "n" }
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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