获取php中两个数组的相似度百分比

Question

I need to take two arrays and come up with a percent of similarity. ie:

array( 0=>'1' , 1=>'2' , 2=>'6' , 3=>array(0=>1))

vers

array( 0=>'1' , 1=>'45' , 2=>'6' , 3=>array(0=>1))

Where I would think that the % is 75

or

array( 0=>'1' , 1=>'2' , 2=>'6' , 3=>array(0=>'1'))

vers

array( 0=>'1' , 1=>'2' , 2=>'6' , 3=>array(0=>'55'))

Not sure how to approach this.. just need to end up with a workable float percent. Thank you .

Answer 1

Assuming both arrays are the same length, you can iterate through and see which values are the same for the keys, for example:

<?php
$a = array(1,2,3,4);
$b = array(1,2,4,4);
$c = 0;
foreach ($a as $k=>$v) {
    if ($v == $b[$k]) $c++;
}
echo ($c/count($a))*100;
// outputs 75
?>

Or just checking whether they contain similar items using in_array.

<?php
$a = array(1,2,3);
$b = array(1,2,4);
$c = 0;
foreach ($a as $i) {
    if (in_array($i,$b)) $c++;
}
echo ($c/count($a))*100;
// outputs 66.66...
?>