Test if one array is a subset of another

Question

How can I determine if one array is a subset of another (all elements in the first are present in the second)?

 $s1 = \"string1>string2>string3>string4&         


        

Answer 1

I would create an associated array of the larger array, then iterate through the smaller array, looking for a non collision, if you find one, return false.

function isSubset($arr1,$arr2){
    $map = Array();
    for ($i=0;$i