PHP array_intersect() - how does it handle different types?

$arrayOne = array('0003', '0004', '0005');
$arrayTwo = array(4, 5, 6);

$intersect = array_intersect($arrayOne, $arrayTwo);

// $intersect would then be = "array(4, 5)"

<?php
$arrayOne = array('0003', '0004', '0005');
$arrayTwo = array(4, 5, 6);

$intersect = array_intersect($arrayOne, $arrayTwo);

print_r($intersect );

?>

foreach($arrayOne as $key => $value)
{
   $arrayOne[$key] = intval($value);
}

Note:  Two elements are considered equal if and only if
(string) $elem1 === (string) $elem2.
In words: when the string representation is the same.