在字符串中每 12 个字符之后添加一个分词符标记

尝试一下自动换行。我认为它应该可以解决你的问题。

试试这个

$newtext = wordwrap($text,12, "<br />");

$text = "Lorem Ipsum is simply dummy text of the printing and typesetting industry.";
$newtext = wordwrap($text, 12, "<br />'n");
echo $newtext;

输出：

Lorem Ipsum
is simply
dummy text
of the
printing and
typesetting
industry. 

http://www.php.net/manual/en/function.wordwrap.php

只是用一个例子来扩展 Shakti 的答案：

$my_string = "Lorem Ipsum is simply dummy text of the printing and typesetting industry.";
$my_wrapped_string = wordwrap($my_string, 12, '<br />');

然后，$my_wrapped_string的值将Lorem Ipsum<br />is simply<br />dummy text<br />of the<br />printing and<br />typesetting<br />industry.

您的预期结果在空格和中断方面似乎非常不一致。听起来你想要一些自定义解决方案，是你追求的更多的东西：

$array = $my_string.explode(" ");
counter = 0;
for(index=0; index<array.length; index++){
    counter += array[index].length+1;
    if(counter > 12){
        array[index-1] += "<br>"; //put some error handling here
        counter = 0;
    }
}
//then convert back to string and do whatever 
// - I tested this in JS and it worked fine

<?php
$text = "A very long woooooooooooooooooord. and something";
$newtext = wordwrap($text, 8, "'n", false);
echo "$newtext'n";
?>

上面的示例将输出：

A very
long
woooooooooooooooooord.
and
something