php append to array

$myArr = [1, 2, 3, 4];

array_push($myArr, 5, 8);
print_r($myArr); // [1, 2, 3, 4, 5, 8]

$myArr[] = -1;
print_r($myArr); // [1, 2, 3, 4, 5, 8, -1]

<?php
$a=array("red","green");
array_push($a,"blue","yellow");
print_r($a);
?>

<?php
  $z = ['me','you', 'he'];
  array_push($z, 'she', 'it');
  print_r($z);
?>

array_push($cart, 13);

<?php

$a=array("red","green");

array_push($a,"blue","yellow");

print_r($a);
?>

<?php
$array1 = array("color" => "red", 2, 4);
$array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);
$result = array_merge($array1, $array2);
/*
Array
(
    [color] => green
    [0] => 2
    [1] => 4
    [2] => a
    [3] => b
    [shape] => trapezoid
    [4] => 4
)
*/
?>

<?php
$stack = array("orange", "banana");
array_push($stack, "apple", "raspberry");
print_r($stack);
?>

$myArray = array("name" => "my name");
echo json_encode($myArray);