How to remove values from an array in PHP?

Question

Is there a PHP function to remove certain array elements from an array?

E.g., I have an array (A) with values and another array (B) from wh

Answer 1

$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);

print_r($result);