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@ 2015-04-23T06:38:28Z

<?php
$arrVal =  array (
    '22' => array(
        '0' => 60,
        '29' => array(
            '0' => 6
        ),
        '30' => array (
            '0' => 5,
            '1' => 8
        ),
        '31' => array (
            '0' => 7,
            '1' => 9,
            '2' => 14,
            '3' => 26
        )
    ),
    '23' =>  12,
    '35' => 10,
    '42' => 22
);
$arrVal = array_map(function($el){ return $el; }, $arrVal);
echo $str = implode(',', $arrVal);

Output
Performance
VLD
References
Branches

array_map: documentation ( source)
implode: documentation ( source)

preferences:dark modelive preview

42.93 ms | 402 KiB | 5 Q