- array_intersect_assoc: documentation ( source)
- print_r: documentation ( source)
<?php
$a=Array
(
'0' => 'H',
'1' => 'e',
'2'=> 'l',
'3' => 'l',
'4' => 'o',
'5' => 'W',
'6' => 'o',
'7' => 'r',
'8' => 'l',
'9' => 'd',
'10' => '!'
);
$b=Array
(
'1' => 'e',
'5' => 'W',
'7' => 'r',
'10' => '!'
);
print_r(array_intersect_assoc ($a,$b)==$b);