(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)
mb_detect_order — 设置/获取 字符编码的检测顺序
encoding
encoding 是一个 array 或者逗号分隔的字符编码列表。
参见支持的编码。
如果省略 encoding 或为 null，它将返回当前字符编码检测顺序的数组。
该设置会影响 mb_detect_encoding() 和 mb_send_mail()。
mbstring 当前实现了以下编码检测筛选器。
如有以下编码列表的无效字节序列，编码的检测将会失败。
UTF-8, UTF-7,
ASCII,
EUC-JP,SJIS,
eucJP-win, SJIS-win,
JIS, ISO-2022-JP
对于 ISO-8859-*，mbstring
总是检测为 ISO-8859-*。
对于 UTF-16、UTF-32、
UCS2 和 UCS4，编码检测总是会失败。
| 版本 | 说明 |
|---|---|
| 8.0.0 |
现在 encoding 可以为 null。
|
示例 #1 mb_detect_order() 示例
<?php
/* 为检测顺序设置枚举列表 */
mb_detect_order("eucjp-win,sjis-win,UTF-8");
/* 通过数组设置检测顺序 */
$ary[] = "ASCII";
$ary[] = "JIS";
$ary[] = "EUC-JP";
mb_detect_order($ary);
/* 显示当前的检测顺序 */
echo implode(", ", mb_detect_order());
?>
示例 #2 案例展示了无效的检测顺序
; 总是检测为 ISO-8859-1 detect_order = ISO-8859-1, UTF-8 ; 总是检测为 UTF-8，由于 ASCII/UTF-7 的值对 UTF-8 是有效的 detect_order = UTF-8, ASCII, UTF-7
Perhaps obvious to most everyone, but the
default filter list was shorter than I expected:
['ASCII','UTF-8'], in that order.
c. 2024, 60% of websites globally declared charset 'UTF-8'
So if you're experimenting with multibyte encodings other than UTF-8, you have to specify your detect_order, choosing from the list of implemented filters.