```

$garbage = array(

"food waste" => "濕垃圾",

"plastic bottles" => "可回收垃圾",

"old newspapers" => "可回收垃圾",

"used batteries" => "有害垃圾"

);

```

這樣就通過鍵（如"food waste"）來獲取對(duì)的值（如"濕垃圾"），實(shí)現(xiàn)對(duì)垃圾分類的智能化引導(dǎo)。

```

$exhibitors = array(

=> array("name" => "ABC公司", "product" => "電子產(chǎn)品"),

=> array("name" => "XYZ公司", "product" => "家具產(chǎn)品")

);

```

這樣就通過鍵（如或）來獲取對(duì)參展商的所有信息。

```

$sales_data = array(

array("month" => "Jan", "sales" => ),

array("month" => "Feb", "sales" => ),

array("month" => "Mar", "sales" => )

);

```

這樣就方便地獲取每個(gè)月的銷售數(shù)據(jù)，進(jìn)而進(jìn)行各種數(shù)據(jù)分析。

```

$chemicals = array(

=> array("name" => "硫酸", "density" => , "color" => "無色"),

=> array("name" => "硝酸", "density" => , "color" => "黃色")

);

```

這樣就通過索引（如或）來獲取對(duì)化學(xué)物質(zhì)的各種屬性。