You can also use:
<?php
$myarray = [
"Orange",
"572" => "Banana",
"omg" => "Chili",
"nevermind" => "mango"
];
$myarray[0] = "NO-Orange";
$myarray["572"] = "BANANAPHONE!!!";
$myarray["omg"] = "NO-Chili";
print_r($myarray);
?>
RESULT:
Array
(
[0] => NO-Orange
[572] => BANANAPHONE!!!
[omg] => NO-Chili
[nevermind] => mango
)
with regards