คือผมไม่เข้าใจกับโค๊ด array php อ่ะครับ พอดีไปก๊อปเค้ามา

<?php
$jquery_ui_v="1.8.5";
$theme=array(
	"0"=>"base",
	"1"=>"black-tie",
	"2"=>"blitzer",
	"3"=>"cupertino",
	"4"=>"dark-hive",
	"5"=>"dot-luv",
	"6"=>"eggplant",
	"7"=>"excite-bike",
	"8"=>"flick",
	"9"=>"hot-sneaks",
	"10"=>"humanity",
	"11"=>"le-frog",
	"12"=>"mint-choc",
	"13"=>"overcast",
	"14"=>"pepper-grinder",
	"15"=>"redmond",
	"16"=>"smoothness",
	"17"=>"south-street",
	"18"=>"start",
	"19"=>"sunny",
	"20"=>"swanky-purse",
	"21"=>"trontastic",
	"22"=>"ui-darkness",
	"23"=>"ui-lightness",
	"24"=>"vader"
);
$jquery_ui_theme=$theme[11];
?>