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@ 2015-07-08T23:55:43Z

<?php

$test = array(
    'abc' => 123,
    'def' => 456,
    'test' => array(
        123 => 'hip',
        'hop' => null
    )
);

foreach ($test as $old => &$arr) {
    if (is_array($arr)) {
        unset($test[$old]);
        foreach ($arr as $new => $v) {
            $test[$old.$new] = $v;
        }
    }
}

var_dump($test);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

27.54 ms | 404 KiB | 5 Q