php all keys in array
<?php
$array = array(
    'fruit1' => 'apple',
    'fruit2' => 'orange',
    'fruit3' => 'grape',
    'fruit4' => 'apple',
    'fruit5' => 'apple');
$keys = array_keys($array);		// return array
$values = array_values($array);	// return array
?>
