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                # PHP array_pad() 函數 ## 定義和用法 array_pad() 函數向一個數組插入帶有指定值的指定數量的元素。 ### 語法 ``` array_pad(array,size,value) ``` | 參數 | 描述 | | --- | --- | | array | 必需。規定數組。 | | size | 必需。指定的長度。整數則填補到右側,負數則填補到左側。 | | value | 必需。用來填補的值。 | ## 提示和注釋 提示:如何設置了負的長度值,該函數會在原始數組之前插入新的元素。(參見例子 2) 注釋:如果 size 參數小于原始數組的長度,該函數不會刪除任何元素。 ## 例子 1 ``` <?php $a=array("Dog","Cat"); print_r(array_pad($a,5,0)); ?> ``` 輸出: ``` Array ( [0] => Dog [1] => Cat [2] => 0 [3] => 0 [4] => 0 ) ``` ## 例子 2 帶有負的 size 參數: ``` <?php $a=array("Dog","Cat"); print_r(array_pad($a,-5,0)); ?> ``` 輸出: ``` Array ( [0] => 0 [1] => 0 [2] => 0 [3] => Dog [4] => Cat ) ```
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