Important, if you're looking to trim/cut/truncate a string so that it will fit a certain byte size (for example to fit in a database field), look at: mb_strcut()
(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)
mb_strwidth — 返回字符串的宽度
返回 string 类型 string 的宽度，其中半角字符计为 1，全角字符计为
2。有关东亚字符宽度的详细信息，请参见 » http://www.unicode.org/reports/tr11/。
全角字符是：
U+1100-U+115F,
U+11A3-U+11A7,
U+11FA-U+11FF,
U+2329-U+232A,
U+2E80-U+2E99,
U+2E9B-U+2EF3,
U+2F00-U+2FD5,
U+2FF0-U+2FFB,
U+3000-U+303E,
U+3041-U+3096,
U+3099-U+30FF,
U+3105-U+312D,
U+3131-U+318E,
U+3190-U+31BA,
U+31C0-U+31E3,
U+31F0-U+321E,
U+3220-U+3247,
U+3250-U+32FE,
U+3300-U+4DBF,
U+4E00-U+A48C,
U+A490-U+A4C6,
U+A960-U+A97C,
U+AC00-U+D7A3,
U+D7B0-U+D7C6,
U+D7CB-U+D7FB,
U+F900-U+FAFF,
U+FE10-U+FE19,
U+FE30-U+FE52,
U+FE54-U+FE66,
U+FE68-U+FE6B,
U+FF01-U+FF60,
U+FFE0-U+FFE6,
U+1B000-U+1B001,
U+1F200-U+1F202,
U+1F210-U+1F23A,
U+1F240-U+1F248,
U+1F250-U+1F251,
U+20000-U+2FFFD,
U+30000-U+3FFFD。
其它所有字符都是半角字符。
string string 的宽度。
| 版本 | 说明 |
|---|---|
| 8.0.0 |
现在 encoding 可以为 null。
|
示例 #1 mb_strwidth() 示例
<?php
var_dump(
mb_strwidth('a'), // 拉丁文小写字母 A
mb_strwidth("\u{ff41}") // 全角拉丁文小写字母 A
);
?>以上示例会输出：
int(1) int(2)
Important, if you're looking to trim/cut/truncate a string so that it will fit a certain byte size (for example to fit in a database field), look at: mb_strcut()