<?php $arr = array ( 0 => 'nested array', 1 => 'nested array', 2 => 'nested array', 3 => 'nested array', 4 => 'nested array', 5 => 'nested array', ); for ($key = 0, $end = max(array_keys($arr)) + 1; array_key_exists($key, $arr); $key++); var_dump($key);
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