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function similarity($a,$b)
{
$a_arr=explode(',',$a);
$b_arr=explode(',',$b);
$num=count(array_intersect($a_arr,$b_arr));
$count=count($a_arr);
return ($num/$count*100).'%';
}
$a="1,2,3,4,5";
$b="1,2,3,4,6";
$c="1,2,4,5,6";
$d="2,3,4,5,6";
$f="7,8,9,10,11";
echo similarity($a,$b).'<br>';
echo similarity($a,$c).'<br>';
echo similarity($a,$d).'<br>';
echo similarity($a,$f).'<br>';