public static PhpArray array_diff_ukey(Context ctx, PhpArray array, PhpArray array0, params PhpValue[] arraysAndComparer)
{
PhpArray[] arrays;
IPhpCallable key_comparer, cmp;
if (!SplitArraysAndComparers(1, array0, arraysAndComparer, out arrays, out key_comparer, out cmp)) return null;
return SetOperation(SetOperations.Difference, array, arrays,
new KeyComparer(new PhpUserComparer(ctx, key_comparer), false));
}