how to delete item from 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$array = [0 => "a", 1 => "b", 2 => "c"];
2unset($array[1]); //Key which you want to delete
3/*
4$array:
5[
6    [0] => a
7    [2] => c
8]
9*/
10//OR
11$array = [0 => "a", 1 => "b", 2 => "c"];
12array_splice($array, 1, 1);//Offset which you want to delet
13/*
14$array:
15[
16    [0] => a
17    [1] => c
18]
19*/

1foreach ($items as $key =>$item){
2  if(condition){
3    unset($item[$key]);
4  }
5}