wordwrap()

(PHP 4 >= 4.0.2, PHP 5, PHP 7)

打断字符串为指定数量的字串

说明

使用字符串断点将字符串打断为指定数量的字串。

参数

输入字符串。

列宽度。

使用可选的$break参数打断字符串。

如果$cut设置为TRUE，字符串总是在指定的$width或者之前位置被打断。因此，如果有的单词宽度超过了给定的宽度，它将被分隔开来。（参见第二个范例）。当它是FALSE，函数不会分割单词，哪怕$width小于单词宽度。

返回值

返回打断后的字符串。

范例

Example #1wordwrap()范例

以上例程会输出：

The quick brown fox
jumped over the lazy
dog.

Example #2wordwrap()范例

以上例程会输出：

A very
long
wooooooo
ooooord.

Example #3wordwrap()例子

以上例程会输出：

A very
long
woooooooooooooooooord.
and
something

参见

• nl2br() 在字符串所有新行之前插入 HTML 换行标记
• chunk_split() 将字符串分割成小块

Another solution to utf-8 safe wordwrap, unsing regular expressions.
Pretty good performance and works in linear time.

Of course don't forget to use preg_quote on the $width and $break parameters if they come from untrusted input.

For those interested in wrapping text to fit a width in *pixels* (instead of characters), you might find the following function useful; particularly for line-wrapping text over dynamically-generated images.
If a word is too long to squeeze into the available space, it'll hyphenate it as needed so it fits the container. This operates recursively, so ridiculously long words or names (e.g., URLs or this guy's signature - http://en.wikipedia.org/wiki/Wolfe+585,_Senior) will still keep getting broken off after they've passed the fourth or fifth lines, or whatever. 

If you'd like to break long strings of text but avoid breaking html you may find this useful. It seems to be working for me, hope it works for you. Enjoy. :) 

Using wordwrap is usefull for formatting email-messages, but it has a disadvantage: line-breaks are often treated as whitespaces, resulting in odd behaviour including lines wrapped after just one word.
To work around it I use this:

I then use linewrap() instead of wordwrap()
hope this helps someone

These functions let you wrap strings comparing to their actual displaying width of proportional font. In this case Arial, 11px. Very handy in some cases since CSS3 is not yet completely supported. 100 strings = ~5 ms
My old sheep word wrap function (posted at the bottom of this page, is kinda old dated and this one is faster and more accurate).

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