PHP排序最为常用的几个函数sort&ksort&asort

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<?php
        
        /*
         *        sort() & rsort()
         */

        $array = array(1,4,52,2,6,9,12,54,3,"a", "c", "b", "aa", "ac", "ab", "赵", "钱", "孙");
        // 按字母或数字排序，如果是字符串，按字符串从左到右优先级比较，即aa<ab
        // 并且将所有下标都去掉，只关心值的绝对位置
        // 不支持中文排序，排序后改变原数组的顺序
        print_r($array);
        echo "<br/>";
        sort($array);
        print_r($array);
        echo "<br/>";
        rsort($array);
        print_r($array);

        
        /*
         *        ksort() & krsort()
         */
        // 按键排序
        $array = array("1"=>"one", "3"=>"three", "2"=>"two");
        print_r($array);
        echo "<br/>";
        ksort($array);
        print_r($array);
        echo "<br/>";
        krsort($array);
        print_r($array);
        echo "<br/>";
        
        /*
         *        asort() & arsort()
         */
        // 按值排序
        $array = array("one"=>"1", "three"=>"3", "two"=>"2");
        print_r($array);
        echo "<br/>";
        asort($array);
        print_r($array);
        echo "<br/>";
        arsort($array);
        print_r($array);
        echo "<br/>";
        

输出结果一：
Array ( [0] => 1 [1] => 4 [2] => 3 [3] => a [4] => c [5] => b [6] => aa [7] => ac [8] => ab [9] => 赵 [10] => 钱 [11] => 孙 )
Array ( [0] => a [1] => aa [2] => ab [3] => ac [4] => b [5] => c [6] => 孙 [7] => 赵 [8] => 钱 [9] => 1 [10] => 3 [11] => 4 )
Array ( [0] => 4 [1] => 3 [2] => 1 [3] => 钱 [4] => 赵 [5] => 孙 [6] => c [7] => b [8] => ac [9] => ab [10] => aa [11] => a )
输出结果二：
Array ( [1] => one [3] => three [2] => two )
Array ( [1] => one [2] => two [3] => three )
Array ( [3] => three [2] => two [1] => one )
输出结果三：
Array ( [one] => 1 [three] => 3 [two] => 2 )
Array ( [one] => 1 [two] => 2 [three] => 3 )
Array ( [three] => 3 [two] => 2 [one] => 1 )