- array_map: documentation ( source)
- array_intersect: documentation ( source)
<?php
$a = array('Amit ', 'Juneja ', ' Amit');
$b = array_map('strtolower',$a);
$b = array_map('ltrim',$b);
$b = array_map('rtrim',$b);
$c = array('gupta','amit');
$d = array_intersect($b,$c);
count($d);