php delete array item by value

1$colors = array("blue","green","red");
2
3//delete element in array by value "green"
4if (($key = array_search("green", $colors)) !== false) {
5    unset($colors[$key]);
6}

1// matrix array
2foreach($appsList as $key => $app) {
3            if($app["app_status"] !== "approved") {
4                // remove orange apps
5                unset($appsList[$key]);
6            }
7}

1$array = [0 => "a", 1 => "b", 2 => "c"];
2unset($array[1]);

1$colors = arrray("blue","green","red");
2if(($key = array_search("greeb",$colors)) !== false)
3{
4unset("$colors[$key]);
5}