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
