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@ 2017-07-05T15:27:50Z

<?php
$s="a(bcdefghijkl(mno)p)q";
$return =   preg_replace_callback(
    '|(\((.+)\))+|',
    function ($matches) {
        return $matches[2];
    },
    $s
);

print_r($return);

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

41.94 ms | 402 KiB | 5 Q