PHP preg_replace也删除换行符

Question

好的，使用file_get_contents阅读文件并删除<?php，<?和/或任何?>标记，但我还要删除其中的所有换行符文件。我怎样才能做到这一点？

例如像这样的文件：

<?php

$txt['dpmod_testing'] = 'Testing';
$txt['dpmodtitle_testing'] = 'My Testing Module';
$txt['dpmodinfo_testing'] = 'Just a Testing Module, nothing special.';
$txt['dpmoddesc_testing'] = 'Here is a description for this testing module that you will see within the Add Modules section![color=red]I can give myself credit for this module if I want to![/color][hr]And this text string also accepts BBC Code!';

?>

应该返回：

$txt['dpmod_testing'] = 'Testing';
$txt['dpmodtitle_testing'] = 'My Testing Module';
$txt['dpmodinfo_testing'] = 'Just a Testing Module, nothing special.';
$txt['dpmoddesc_testing'] = 'Here is a description for this testing module that you will see within the Add Modules section![color=red]I can give myself credit for this module if I want to![/color][hr]And this text string also accepts BBC Code!';

但是，当我使用file_put_contents：

时，我会将此文件写入文件

$txt['dpmod_testing'] = 'Testing';

$txt['dpmodtitle_testing'] = 'My Testing Module';

$txt['dpmodinfo_testing'] = 'Just a Testing Module, nothing special.';

$txt['dpmoddesc_testing'] = 'Here is a description for this testing module that you will see within the Add Modules section![color=red]I can give myself credit for this module if I want to![/color][hr]And this text string also accepts BBC Code!';

上面有2个换行符，下面还有2个换行符。如何删除所有这些换行符？

这是我用来从文件中删除php标签的preg_replace，但是如何修改它以保持文件的方式，并删除所有换行符？

preg_replace(array('/<\?php/s', '/\?>/s', '/<\?/s'), array('', '', ''), $str);

谢谢你们：）

Answer 1

喜欢用

写的

Removing redundant line breaks with regular expressions

您可以在阵列中添加'（？:(？：\ r \ n | \ r | \ n）\ s *）{2} / s'和'' ..但我没有检查

确保ich只匹配新线两次

Answer 2

这似乎是最简单的解决方案;用PHP完美地为我工作：

http://php.net/manual/en/function.preg-replace.php#85883

基本上你在正则表达式选择模式的开头加上“（* ANYCRLF）”。自PCRE版本7.3起支持

---

这里有更详细的解释：

http://en.wikipedia.org/wiki/Perl_Compatible_Regular_Expressions

（“换行/换行选项”部分）

Answer 3

更好的是：

$content = file_get_contents('file.php');
$content = trim($content);
$content = ltrim($content, '<?php');
$content = ltrim($content, '<?');
$content = rtrim($content, '?>');
$content = trim($content);
file_put_contents('file.php', $content);