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                ## 一、概述 數組是存儲多個數值的變量,并且您可以根據鍵訪問其中的值; ``` $arr = array("","",""); $arr = ["","",""]; ``` 在 PHP 中,有三種類型的數組: * **數值數組**- 帶有數字 ID 鍵的數組 * **關聯數組**- 帶有指定的鍵的數組,每個鍵關聯一個值 * **多維數組**- 包含一個或多個數組的數組 ## 二、數值數組 有兩種創建數值數組的方法: 自動分配 ID 鍵(ID 鍵總是從 0 開始): ``` $cars=array("Volvo","BMW","Toyota"); ``` 人工分配 ID 鍵: ``` $cars[0]="Volvo"; $cars[1]="BMW"; $cars[2]="Toyota" ``` 遍歷數值數組: ``` <?php $cars=array("Volvo","BMW","Toyota"); $arrlength=count($cars); for($x=0;$x<$arrlength;$x++) { echo $cars[$x]; echo "<br>"; } ?> ``` ## 三、關聯數組 關聯數組是使用您分配給數組的指定的鍵的數組; 這里有兩種創建關聯數組的方法: ``` $age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43"); ``` 或: ``` $age['Peter']="35"; $age['Ben']="37"; $age['Joe']="43"; ``` 遍歷: ``` <?php $age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43"); foreach($age as $x=>$x_value) { echo "Key=" . $x . ", Value=" . $x_value; echo "<br>"; } ?> ``` ## 四、多維數組 一個數組中的值可以是另一個數組,另一個數組的值也可以是一個數組。依照這種方式,我們可以創建二維或者三維數組;在多維數組中,主數組中的每一個元素也可以是一個數組,子數組中的每一個元素也可以是一個數組; ``` <?php // 二維數組: $cars = array ( array("Volvo",100,96), array("BMW",60,59), array("Toyota",110,100) ); ?> ``` 實例: ``` <?php $sites = array ( "runoob"=>array ( "菜鳥教程", "http://www.runoob.com" ), "google"=>array ( "Google 搜索", "http://www.google.com" ), "taobao"=>array ( "淘寶", "http://www.taobao.com" ) ); print("<pre>"); // 格式化輸出數組 print_r($sites); print("</pre>"); ?> ```
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