remove key of an array php

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$result_Member = $this->Member->get_list_member_belong_to_company($id);
2
3/* 
4$result_Member = array(
5	[10] => 10,
6    [20] => 11,
7    [30] => 12,
8)
9*/
10
11// remove key, get values only
12$member_ids = array_values($result_Member);
13
14/*
15$result_Member = array(
16	[0] => 10,
17    [1] => 11,
18    [2] => 12,
19)
20*/