mb_strimwidth()

(PHP 4 >= 4.0.6, PHP 5, PHP 7)

获取按指定宽度截断的字符串

说明

按$width将字符串$str截短。

参数

要截短的string。

开始位置的偏移。从这些字符数开始的截取字符串。（默认是 0 个字符）如果 start 是负数，就是字符串结尾处的字符数。

所需修剪的宽度。负数的宽度是从字符串结尾处统计的。

当字符串被截短的时候，将此字符串添加到截短后的末尾。

$encoding参数为字符编码。如果省略，则使用内部字符编码。

返回值

截短后的string。如果设置了$trimmarker，还将结尾处的字符替换为$trimmarker，并符合$width的宽度。

更新日志

范例

mb_strimwidth()例子

参见

• mb_strwidth()返回字符串的宽度
• mb_internal_encoding()设置/获取内部字符编码

Note that the trimmarker removes characters from the end of the string to trim, so
$hello = 'Lorem ipsum dolor sit amet, lorem ipsum';
$trimmarker = '......................';
echo mb_strimwidth($hello, 0, 20, $trimmarker);
 
will only add the values of the trim marker, as the character number of $trimmarker is longer than the specified value to trim to, so it will return: 
 ......................
It is therefore better to use this: 
mb_strimwidth($hello, 0, 20). $trimmarker;
as the trimmarker won't remove characters of the string in order to make space for itself. It will return:
Lorem ipsum dolor si......................

While having the option to append a string to the end is nice, you can run into the problem of having a space between the append if the width is truncated after a space. I find something like this to be more attractive in the output, although messy in the code.
rtrim(mb_strimwidth($string, 0, 24))."..."

I had a problem (as in another comment) with a space being between the trailing dots and the subject being truncated. Here's how I fixed it: 

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