如何使用PHP排序key为字母+数字的数组
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<?php
$fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");
arsort($fruits);
foreach ($fruits as $key => $val) {
echo "$key = $val\n";
}
?>
输出结果（正序排序）：
a = orange
d = lemon
b = banana
c = apple
<?php
$fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");
asort($fruits);
foreach ($fruits as $key => $val) {
echo "$key = $val\n";
}
?>
输出结果（倒序排序）：
c = apple
b = banana
d = lemon
a = orange
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