Question

How to check whether an array is subset of another array in PHP

Answer 1

function isSubset($arr1, $arr2) {
    $size1 = count($arr1);
    $size2 = count($arr2);

    for ($i = 0; $i < $size2; $i++) {
        for ($j = 0; $j < $size1; $j++) {
            if ($arr2[$i] == $arr1[$j])
                break;
            }
            if ($j == $size1)
                return false;
        }
        return true;
    }


$arr1 = array( 5, 1, 8, 12, 40, 7, 9, 100 );
$arr2 = array( 8, 40, 9, 1 );
 
if (isSubset($arr1, $arr2))
    echo "yes";
else
    echo "no";


 
 
 
   
/*
run:
   
yes
   
*/

 

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