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<?php $arr = array ( 0 => 'nested array', 1 => 'nested array', 2 => 'nested array', 3 => 'nested array', 5 => 'nested array', 7 => 'nested array', ); for ($key = 0; array_key_exists($key, $arr); $key++); var_dump($key);
Output for 4.3.0 - 7.1.7
int(4)