array_difference( array1, array2 )

Returns: array

Throws: InvalidArgumentType

Returns a new array containing the difference of both arrays. These are the values that are only in the first array. If an array is not provided to either argument, InvalidArgumentType will be thrown.

array_difference( [ 10, 20, 30 ], [ 20, 30, 40 ] );

Output: [ 10 ]