PHP: Insert a substring into a HTML string after every N characters?

Question

I have a long string that will be displayed on my page. I want it to have a line break after every 40 chars. How can I insert these?

Answer 1

Use the <br> or <wbr> tag:

wordwrap($string, 40, "<wbr>", true);

Basically, <wbr> represents a place where the browser is allowed to break the word on a new line, but it won't display a space if it doesn't have to.

<br> on the other hand will always create a line break.

Answer 2

使用chunk_split 手册

chunk_split($string, 40, "\n");

Answer 3

$string = 'loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong string';
echo wordwrap($string, 40, "\n", true);