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                # 求出一個數組的最大值,并得到對應的數組下標 > 思路 > 1. 定義一個數組 > 2. 將第一個數默認為最大值 > 3. 從第二個數開始進行循環比較,發現有更大的就進行交換 ## Go語言實現 ```go // 求出一個數組的最大值,并得到對應的下標 var intArr [5]int = [...]int{1, -1, 9, 90, 11} maxVal := intArr[0] maxValIndex := 0 for i := 1; i < len(intArr); i++ { // 開始從第二個數開始比較,如果發現有更大的就進行交換 if maxVal < intArr[i] { maxVal = intArr[i] maxValIndex = i } } fmt.Printf("maxVal=%v maxValIndex=%v", maxVal, maxValIndex) ``` ## PHP實現 ```php class WArray { protected $array = []; public function __construct($array) { $this->array = $array; } public function getArrayMaxValueAndIndex() { $maxVal = $this->array[0]; $maxValIndex = 0; foreach ($this->array as $k => $v) { if ($maxVal < $this->array[$k]) { $maxVal = $this->array[$k]; $maxValIndex = $k; } } return json_encode([ 'maxVal' => $maxVal, 'maxValIndex' => $maxValIndex, ]); } } ``` **調用結果** ```php // 調用 $warray = new WArray([1, -1, 9, 90, 11]); $arrayMaxValueAndIndex = $warray->getArrayMaxValueAndIndex(); dd($arrayMaxValueAndIndex); // 這里的dd是一個打印函數 // 結果顯示 {"maxVal":90,"maxValIndex":3} ```
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