Detailed explanation of several common sorting methods in php (with code)

烟雨青岚
Release: 2023-04-08 19:06:01
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Detailed explanation of several common sorting methods in php (with code)

Several common sorting methods in PHP

PHP has many sorting methods. This article will introduce you to several common sorting methods. Methods: bubble sort, exchange sort, selection sort, insertion sort, quick sort. I hope to be helpful.

Sort method 1: Bubble sort

function BubbleSort($arr) {
    // 获得数组总长度
    $num = count($arr);
    // 正向遍历数组
    for ($i = 1; $i < $num; $i++) {
        // 反向遍历
        for ($j = $num - 1; $j >= $i ; $j--) {
            // 相邻两个数比较
            if ($arr[$j] < $arr[$j-1]) {
                // 暂存较小的数
                $iTemp = $arr[$j-1];
                // 把较大的放前面
                $arr[$j-1] = $arr[$j];
                // 较小的放后面
                $arr[$j] = $iTemp;
            }
        }
    }
    return $arr;
}
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Sort method 2: Exchange sort

function ExchangeSort($arr){
    $num = count($arr);
    // 遍历数组
    for ($i = 0;$i < $num - 1; $i++) {
        // 获得当前索引的下一个索引
        for ($j = $i + 1; $j < $num; $j++) {
            // 比较相邻两个的值大小
            if ($arr[$j] < $arr[$i]) {
                // 暂存较小的数
                $iTemp = $arr[$i];
                // 把较大的放前面
                $arr[$i] = $arr[$j];
                // 较小的放后面
                $arr[$j] = $iTemp;
            }
        }
    }
    return $arr;
}
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Sort method 3: Selection sort

function SelectSort($arr) {
    // 获得数组总长度
    $num = count($arr);
    // 遍历数组
    for ($i = 0;$i < $num-1; $i++) {
        // 暂存当前值
        $iTemp = $arr[$i];
        // 暂存当前位置
        $iPos = $i;
        // 遍历当前位置以后的数据
        for ($j = $i + 1;$j < $num; $j++){
            // 如果有小于当前值的
            if ($arr[$j] < $iTemp) {
                // 暂存最小值
                $iTemp = $arr[$j];
                // 暂存位置
                $iPos = $j;
            }
        }
        // 把当前值放到算好的位置
        $arr[$iPos] = $arr[$i];
        // 把当前值换成算好的值
        $arr[$i] = $iTemp;
    }
    return $arr;
}
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Sorting method 4: Insertion sorting

function InsertSort($arr){
    $num = count($arr);
    // 遍历数组
    for ($i = 1;$i < $num; $i++) {
        // 获得当前值
        $iTemp = $arr[$i];
        // 获得当前值的前一个位置
        $iPos = $i - 1;
        // 如果当前值小于前一个值切未到数组开始位置
        while (($iPos >= 0) && ($iTemp < $arr[$iPos])) {
            // 把前一个的值往后放一位
            $arr[$iPos + 1] = $arr[$iPos];
            // 位置递减
            $iPos--;
        }
        $arr[$iPos+1] = $iTemp;
    }
    return $arr;
}
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Sorting method 5: Quick sort

function QuickSort($arr){
    $num = count($arr);
    $l = $r = 0;
    $left = $right = array();
    // 从索引的第二个开始遍历数组
    for ($i = 1;$i < $num; $i++) {
        // 如果值小于索引1
        if ($arr[$i] < $arr[0]) {
            // 装入左索引数组(小于索引1的数据)
            $left[] = $arr[$i];
            $l++;
        } else {
            // 否则装入右索引中(大于索引1的数据)
            $right[] = $arr[$i];
            $r++; //
        }       
    }
    // 如果左索引有值 则对左索引排序
    if($l > 1) {
        $left = QuickSort($left);
    }
    // 排序后的数组
    $new_arr = $left;
    // 将当前数组第一个放到最后
    $new_arr[] = $arr[0];
    // 如果又索引有值 则对右索引排序
    if ($r > 1) {
        $right = QuickSort($right);
    }
    // 根据右索引的长度再次增加数据
    for($i = 0;$i < $r; $i++) {
        $new_arr[] = $right[$i];
    }
    return $new_arr;
}
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