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                選擇排序(Selection sort)是一種簡單直觀的排序算法。它的工作原理是:第一次從待排序的數據元素中選出最小(或最大)的一個元素,存放在序列的起始位置,然后再從剩余的未排序元素中尋找到最小(大)元素,然后放到已排序的序列的末尾。以此類推,直到全部待排序的數據元素的個數為零。選擇排序是不穩定的排序方法。 ``` function selection_sort($array){ $count = count($array); for ($i = 0; $i < $count-1; $i++) { $min = $i; for ($j = $i+1; $j<$count; $j++) { //從小到大排序 if ($array[$min] > $array[$j]) { $min = $j; } } if ($min != $i){ $temp = $array[$min]; $array[$min] = $array[$i]; $array[$i] = $temp; } } return$array; } $old_array=array(3,4,5,6,8,2,12); $new_array=selection_sort($old_array); print_r($new_array); ```
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