Online PHP editor | output for kHkjb

@ 2015-04-15T15:46:01Z

<?php

$array = [
    1 => [
        1 => [
            'anna',
            'alice'
        ],
        2 => [
            'bob',
            'bartold'
        ]
    ],
    2 => [
        1 => [
            'carol'
        ],
        2 => [
            'david'
        ]
    ]
];

$result = [];
$currentIndex = 1;

array_walk_recursive($result, function($value, $key) use (&$result, &$currentIndex)) {
    if (!is_array($value)) {
        $result[$currentIndex] = $value;
        $currentIndex++;
    }
}

var_dump($result);

Output for 5.4.0 - 5.4.39: Parse error: syntax error, unexpected ')', expecting '{' in /in/kHkjb on line 27
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/kHkjb on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected '[' in /in/kHkjb on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/kHkjb on line 3
Process exited with code 255.

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