掌握PHP中对数组进行排序的正确姿势

PHP中数组是较为常用的数据类型，如何对数组中的数据进行排序，以方便对数据进行管理，本文就带大家一起来看一看如何利用PHP内置函数对数组进行排序。

1.依据数组键值对数组排序

<?php$arr1 = array(3,1,5,2,0);sort($arr1);print_r($arr1);echo "<br>";$arr2 = array(3,1,5,2,0);rsort($arr2);print_r($arr2);?>

输出：Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 5 )      Array ( [0] => 5 [1] => 3 [2] => 2 [3] => 1 [4] => 0 )

sort() - 对数组进行升序排列； rsort() - 对数组进行降序排列

2.依据关联数组键值对数组排序

<?php$fruits1 = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");arsort($fruits1);foreach ($fruits1 as $key => $val) {    echo "$key = $val;";}echo "<br>";$fruits2 = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");asort($fruits2);foreach ($fruits2 as $key => $val) {    echo "$key = $val\n";}?>

输出：a = orange;d = lemon;b = banana;c = apple;      c = apple b = banana d = lemon a = orange

arsort() - 根据关联数组的值，对数组进行降序排列；asort() - 根据关联数组的值，对数组进行升序排列

3. 根据关联数组的键对数组排序

<?php$fruits1 = array("d"=>"lemon", "a"=>"orange", "b"=>"banana", "c"=>"apple");krsort($fruits1);foreach ($fruits1 as $key => $val) {    echo "$key = $val\n";}echo "<br>";$fruits2 = array("d"=>"lemon", "a"=>"orange", "b"=>"banana", "c"=>"apple");ksort($fruits2);foreach ($fruits2 as $key => $val) {    echo "$key = $val\n";}?>

输出：d = lemon c = apple b = banana a = orange      a = orange b = banana c = apple d = lemon

krsort() - 根据关联数组的键，对数组进行降序排列；ksort() - 根据关联数组的键，对数组进行升序排列

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