php 捕获文本区域中的换行符（换行、换行）字符
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Capturing linebreaks (newline,linefeed) characters in a textarea
提问by lock
I have a form with a <textarea>and I want to capture any line breaks in that textarea on the server-side, and replace them with a <br/>.
我有一个带有 a 的表单，<textarea>我想捕获服务器端该 textarea 中的任何换行符，并将它们替换为<br/>.
Is that possible?
那可能吗？
I tried setting white-space:preon the textarea's CSS, but it's still not enough.
我尝试white-space:pre在textarea的 CSS上进行设置，但仍然不够。
回答by Marc
回答by Law
The nl2br()function exists to do exactly this:
该nl2br()函数的存在正是为了做到这一点：
However, this function adds br tags but does not actually remove the new lines - this usually isn't an issue, but if you want to completely strip them and catch carriage returns as well, you should use a str_replaceor preg_replace
然而，这个函数添加了 br 标签，但实际上并没有删除新行——这通常不是问题，但如果你想完全去除它们并捕获回车，你应该使用 a str_replaceorpreg_replace
I think str_replace would be slightly faster but I have not benchmarked;
我认为 str_replace 会稍微快一点，但我没有进行基准测试；
$val = str_replace( array("\n","\r","\r\n"), '<br />', $val );
or
或者
$val = preg_replace( "#\n|\r|\r\n#", '<br />', $val );
回答by Law
If you're going to use str_replaceor preg_replace, you should probably place the "\r\n"at the beginning of the array, otherwise a \r\nsequence will be translated into two <br/>tags (since the \rwill be matched, and then the \nwill be matched).
如果您要使用str_replaceor preg_replace，您可能应该将 放在"\r\n"数组的开头，否则一个\r\n序列将被翻译成两个<br/>标签（因为\r将匹配，然后\n将匹配）。
eg:
例如：
$val = str_replace( array("\r\n", "\n","\r"), '<br />', $val );
or
或者
$val = preg_replace( "#\r\n|\n|\r#", '<br />', $val );
回答by cssyphus
For those wanting an answer that does not rely on nl2br():
对于那些想要不依赖于的答案的人nl2br()：
$newList = ereg_replace( "\n",'|', $_POST['theTextareaContents']);
or (in this case):
或（在这种情况下）：
$newList = ereg_replace( "\n",'<br/>', $_POST['theTextareaContents']);
PHP Side: from Textarea string to PHP string
PHP 端：从 Textarea 字符串到 PHP 字符串
$newList = ereg_replace( "\n",'|', $_POST['theTextareaContents']);
PHP Side: PHP string back to TextArea string:
PHP 端：PHP 字符串回 TextArea 字符串：
$list = str_replace('|', ' ', $r['db_field_name']);
