ksort()函数是PHP中的内置函数，用于根据其键值以升序对数组进行排序。它以保持索引和值之间的关系的方式进行排序。
用法:
bool ksort( $array, $sorting_type )
参数：该函数接受上述和以下描述的两个参数：
$array:此参数指定需要排序的数组。它是必填参数。
$sorting_type:这是一个可选参数。下面讨论了不同的排序类型：SORT_REGULAR:$sorting_type的值为SORT_REGULAR，然后正常比较各项。
SORT_NUMERIC:$sorting_type的值为SORT_NUMERIC，然后对项目进行数值比较。
SORT_STRING:$sorting_type的值为SORT_STRING，然后将项目作为字符串进行比较。
SORT_LOCALE_STRING:$sorting_type的值为SORT_STRING，然后根据当前语言环境将项目作为字符串进行比较。
返回值：如果成功，则此函数返回True；如果失败，则返回False。
以下示例程序旨在说明PHP中的ksort()函数。
程序1:
// PHP program to illustrate
// ksort()function
// Input differet array elements
$arr = array(“13″ =>”ASP.Net”,
“12” =>”C#”,
“11” =>”Graphics”,
“4” =>”Video Editing”,
“5” =>”Photoshop”,
“6” =>”Article”,
“4” =>”Placement”,
“8” =>”C++”,
“7” =>”XML”,
“10” =>”Android”,
“1” =>”SQL”,
“2” =>”PL/Sql”,
“3” =>”End”,
“0” =>”Java”,
);
// Implementation of ksort()
ksort($arr);
// for-Loop for displaying result
foreach ($arr as $key => $val) {
echo “[$key] = $val”;
echo”\n”;
}
?>
输出：
[0] = Java
[1] = SQL
[2] = PL/Sql
[3] = End
[4] = Placement
[5] = Photoshop
[6] = Article
[7] = XML
[8] = C++
[10] = Android
[11] = Graphics
[12] = C#
[13] = ASP.Net
程序2:
// PHP program to illustrate
// ksort function
// Input differet array elements
$arr = array(“z” => 11,
“y” => 22,
“x” => 33,
“n” => 44,
“o” => 55,
“b” => 66,
“a” => 77,
“m” => 2,
“q” => -11,
“i” => 3,
“e” => 56,
“d” => 1,
);
// Implementation of ksort
ksort($arr);
// for-Loop for displaying result
foreach ($arr as $key => $val) {
echo “[$key] = $val”;
echo”\n”;
}
?>
输出：
[a] = 77
[b] = 66
[d] = 1
[e] = 56
[i] = 3
[m] = 2
[n] = 44
[o] = 55
[q] = -11
[x] = 33
[y] = 22
[z] = 11
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