sort
sort - 給一個數組的元素排序。排序後，數組各元素原來的 key 也因為排序而改變。sort 函數樣本如下：複製代碼 代碼如下:<html>
<body>
<?php
$a = array(1,2,4,5,3,9);
echo "before sorting: <br />";
foreach ($a as $key=>$value)
{
echo "a[$key]: $value <br />";
}
sort($a);
echo "after sorting: <br />";
foreach ($a as $key=>$value)
{
echo "a[$key]: $value <br />";
}
?>
</body>
</html>
返回的顯示結果是： 複製代碼 代碼如下:before sorting:
a[0]: 1
a[1]: 2
a[2]: 4
a[3]: 5
a[4]: 3
a[5]: 9
after sorting:
a[0]: 1
a[1]: 2
a[2]: 3
a[3]: 4
a[4]: 5
a[5]: 9
asort
asort - 給數組的元素排序，保留每個元素原來的key。
我們將上面的樣本中的 sort($a) 改成 asort($a)，得到的結果是： 複製代碼 代碼如下:before sorting:
a[0]: 1
a[1]: 2
a[2]: 4
a[3]: 5
a[4]: 3
a[5]: 9
after sorting:
a[0]: 1
a[1]: 2
a[4]: 3
a[2]: 4
a[3]: 5
a[5]: 9
ksort
ksort - 根據 key 的大小給數組每個元素排序。ksort 函數樣本如下： 複製代碼 代碼如下:<html>
<body>
<?php
$fruits = array("d"=>"lemon", "a"=>"orange", "b"=>"banana", "c"=>"apple");
ksort($fruits);
foreach ($fruits as $key => $val) {
echo "$key : $val <br />";
}
?>
</body>
</html>
返回的結果如下： 複製代碼 代碼如下:a : orange
b : banana
c : apple
d : lemon
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