get all keys as an arrray code example
Example: 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
?>