在 PHP 中，如何折叠 heredoc（此处为文档）中的换行符？

Question

出于 CLI 目的，我想部分折叠（忽略换行符）在 heredoc（此处文档）内。

目前，我在要折叠的行末尾使用 %%，然后使用 str_replace("%%\n",'', $string); 替换它们。但是我觉得不太舒服。

有没有逃生绳或更聪明的方法？

例如：

<?php

$string=<<<EOL
This is a single long line, and it has to be
in one line, though the SideCI thing (as a 
coding regulation) I have to line break.
But this line stays short.
And this line too.
And the backslash such as \
won't work. Nor /
won't work.
My alternative way is to use %%
strings and replace them later.

EOL;

$string .= 'And I don\'t want to do this ';
$string .= 'to merge strings.';

echo str_replace("%%\n",'', $string);

我得到如下：

This is a single long line, and it has to be
in one line, though the SideCI thing (as a 
coding regulation) I have to line break.
But this line stays short.
And this line too.
And the backslash such as \
won't work. Nor /
won't work.
My alternative way is to use strings and replace them later.
And I don't want to do this to merge strings.

有什么想法吗？

当前结论（2018/01/17）

Disable line breaks as a default behavior, and use BR tags to line break instead.
1. Replace PHP_EOL(line breaks) to ''(blank).
2. Replace the BR tags to PHP_EOL.

示例代码：

<?php

$string=<<<EOL
This is a single long line, and it has to be
in one line, though the SideCI thing (as a 
coding regulation) I have to line break.<br>
But this line stays short.<br>
And this line too.<br>
My post alternative way was to use %%
chars and replace them later.<br>

EOL;

$string = str_replace(PHP_EOL,'', $string);
$string = str_ireplace(["<br />","<br>","<br/>"], PHP_EOL, $string);

echo $string;

Answer 1

我个人会使用 {nbr} 之类的东西，因为 %% 看起来太笼统了，其中 {nbr} 是 "no break" 而 {...} 在模板中很常见，那只是一个意见。

但我也会使用 regx 而不是 str_replace

preg_replace('/{nbr}[\r\n]+/', '', $str);

这样它匹配 \r、\r\n、\n 甚至 \n\n 或旧的 Mac、Windows、Linux 和多行结尾。

可以看到it here:

Answer 2

您可以诉诸修改 HTML 标准，即使用 <br> 标记来说明您何时需要换行符。对于习惯 HTML...

的人来说，这会感觉更直观

$string=<<<EOL
This is a single long line, and it has to be
in one line, though the SideCI thing (as a
coding regulation) I have to line break.
But this line stays short.
And this line too.
And the backslash such as \<br>
won't work. Nor /<br>
won't work.<br>
My alternative way is to use %%<br>
strings and replace them later.

EOL;

$string = str_replace(PHP_EOL,'', $string);
$string = str_ireplace(["<br />","<br>","<br/>"], PHP_EOL, $string);
echo $string;

请注意使用 PHP_EOL 以使用新 line/line 中断或您使用的平台具有的任何组合的正确当前编码。

在 PHP 中，如何折叠 heredoc（此处为文档）中的换行符？

In PHP how can I collapse the line breaks inside heredoc (here document)?

php

heredoc

line-breaks

当前结论（2018/01/17）