blocks|key|3245247|text|井,|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3245248|$xml+=+"l
vv";|code-block|syntax|javascript|3245249|很管用。|3245250|您还可以使用以下内容：|3245251|$xml+=+"l\nvv";|3245252|或|3245253|$xml+=+<<<XML
l
vv
XML;|3245254|3245255|基于注释进行编辑：|3245256|可以使用.=运算符连接字符串。|offset|length|style|CODE|3245257|$str+=+"Hello";
$str+.=+"+World";
echo+$str;+//Will+echo+out+"Hello+World";|3245258|entityMap^0|0|0|0|0|0|0|0|0|0|4|2|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|15|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|16|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|18|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|19|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|1B|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|1C|8|@$V|1D|W|1E|X|Y]]|9|@]|A|$]]|$1|Z|3|10|5|D|7|1F|8|@]|9|@]|A|$E|F]]|$1|11|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|12|$]]

Well,

<pre><code>$xml = "l
vv";
</code></pre>

Works.

You can also use the following:

<pre><code>$xml = "l\nvv";
</code></pre>

or

<pre><code>$xml = &lt;&lt;&lt;XML
l
vv
XML;
</code></pre>

<hr>

<h2>Edit based on comment:</h2>

You can concatenate strings using the <code>.=</code> operator.

<pre><code>$str = "Hello";
$str .= " World";
echo $str; //Will echo out "Hello World";
</code></pre>

blocks|key|3458522|text|PHP有Heredoc和Nowdoc字符串，这是在PHP中处理多行字符串的最佳方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3458523|http://php.net/manual/en/language.types.string.php#language.types.string.syntax.heredoc|offset|length|3458524|$str+=+<<<EOD
Example+of+string
spanning+multiple+lines
using+heredoc+syntax.
$var+is+replaced+automatically.
EOD;|code-block|syntax|javascript|3458525|Nowdoc类似于Heredoc，但它不会替换变量。|3458526|$str+=+<<<'EOD'
Example+of+string
spanning+multiple+lines
using+nowdoc+syntax.
$var+is+NOT+replaced+in+a+nowdoc.
EOD;|3458527|您不必使用"EOD“作为开始/结束标识符；它可以是您想要的任何字符串。|style|CODE|3458528|注意缩进。在PHP7.3之前，结束标识符EOD不能缩进，否则不会识别它。在PHP7.3和更高版本中，EOD可以通过空格或制表符进行缩进，在这种情况下，将从heredoc/nowdoc字符串中的所有行中剥离缩进。|BOLD|3458529|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|2F|0|0|0|0|0|6|3|0|K|3|1E|3|U|23|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@$D|14|E|15|1|16]]|A|$]]|$1|F|3|G|5|H|7|17|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|18|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|19|8|@]|9|@]|A|$I|J]]|$1|O|3|P|5|6|7|1A|8|@$D|1B|E|1C|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1D|8|@$D|1E|E|1F|Q|R]|$D|1G|E|1H|Q|R]|$D|1I|E|1J|Q|U]]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]]|W|$X|$5|Y|Z|10|A|$11|C]]]]

PHP has Heredoc and Nowdoc strings, which are the best way to handle multiline strings in PHP.
<a href="http://php.net/manual/en/language.types.string.php#language.types.string.syntax.heredoc" rel="nofollow noreferrer">http://php.net/manual/en/language.types.string.php#language.types.string.syntax.heredoc</a>
<pre class="lang-php prettyprint-override"><code>$str = &lt;&lt;&lt;EOD
Example of string
spanning multiple lines
using heredoc syntax.
$var is replaced automatically.
EOD;
</code></pre>
A Nowdoc is like a Heredoc, but it doesn't replace variables.
<pre><code>$str = &lt;&lt;&lt;'EOD'
Example of string
spanning multiple lines
using nowdoc syntax.
$var is NOT replaced in a nowdoc.
EOD;
</code></pre>
You don't have to use &quot;<code>EOD</code>&quot; as your start/end identifier; it can be any string you want.
Beware indentation. Prior to PHP 7.3, the end identifier <code>EOD</code> must not be indented at all or PHP won't acknowledge it. In PHP 7.3 and higher, <code>EOD</code> may be indented by spaces or tabs, in which case the indentation will be stripped from all lines in the heredoc/nowdoc string.

blocks|key|409066|text|不确定它在性能方面的表现如何，但对于不重要的地方，我喜欢这种格式，因为我可以确定它使用的是\r\n+(CRLF)，而不是我的PHP文件恰好保存为的任何格式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|409067|$text="line1\r\n"+.
++++++"line2\r\n"+.
++++++"line3\r\n";|code-block|syntax|javascript|409068|它还可以让我随心所欲地缩进。|409069|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Not sure how it stacks up performance-wise, but for places where it doesn't really matter, I like this format because I can be sure it is using \r\n (CRLF) and not whatever format my PHP file happens to be saved in.

<pre><code>$text="line1\r\n" .
 "line2\r\n" .
 "line3\r\n";
</code></pre>

It also lets me indent however I want.

blocks|key|3245234|text|$xml="l"+.+PHP_EOL;
$xml.="vv";
echo+$xml;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3245235|将回显：|unstyled|3245236|l
vv|3245237|有关PHP_EOL的文档。|offset|length|3245238|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/reserved.constants.php^0|0|0|0|2|7|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|V|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|F|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

<pre><code>$xml="l" . PHP_EOL;
$xml.="vv";
echo $xml;
</code></pre>

Will echo:

<pre><code>l
vv
</code></pre>

Documentation on <a href="http://php.net/manual/en/reserved.constants.php" rel="noreferrer">PHP_EOL</a>.

blocks|key|409090|text|另一种解决方案是使用output+buffering，您可以收集输出/回显的所有内容，并将其存储在一个变量中。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|409091|<?php
ob_start();+

?>line1
line2
line3<?php+

$xml+=+ob_get_clean();|code-block|syntax|javascript|409092|请注意，对于这种情况，输出缓冲在性能和代码整洁性方面可能不是最好的解决方案，但值得在这里留下来参考。|409093|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.ob-start.php^0|A|G|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

Another solution is to use <a href="http://php.net/manual/en/function.ob-start.php" rel="noreferrer">output buffering</a>, you can collect everything that is being outputted/echoed and store it in a variable.

<pre><code>&lt;?php
ob_start(); 

?&gt;line1
line2
line3&lt;?php 

$xml = ob_get_clean();
</code></pre>

Please note that output buffering might not be the best solution in terms of performance and code cleanliness for this exact case but worth leaving it here for reference.

blocks|key|409029|text|也许可以试试"=“的".=”索引？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|409030|$xml="l";
$xml.="vv";|code-block|syntax|javascript|409031|会给你"lvv"；|409032|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Maybe try ".=" indead of "="?

<pre><code>$xml="l";
$xml.="vv";
</code></pre>

will give you "lvv";

blocks|key|405687|text|PHP有两个内置方法HEREDOC和NOWDOC来处理多行字符串。HEREDOC也有它的语法<<<。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|405688|以下是使用HEREDOC的多行PHP字符串的示例，|405689|<?php
echo+<<<EOT
My+name+is+BB.+I+am+printing+some+Text.
Now,+I+am+printing+SECOND+LINE.
This+should+print+a+capital+'A':+\x41
EOT;
?>|code-block|syntax|javascript|405690|注意：：如果您希望使用本地服务器检查上述代码的正确输出，则必须在CMD或XAMPP+Shell上运行完整的代码。|offset|length|style|BOLD|405691|entityMap^0|0|0|0|0|3|4|1G|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@$K|U|L|V|M|N]|$K|W|L|X|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

PHP has two inbuilt methods HEREDOC and NOWDOC to handle multiline strings. HEREDOC has also it syntax &lt;&lt;&lt;.
Here is the example of multiline PHP string by using HEREDOC,
<pre><code>&lt;?php
echo &lt;&lt;&lt;EOT
My name is BB. I am printing some Text.
Now, I am printing SECOND LINE.
This should print a capital 'A': \x41
EOT;
?&gt;
</code></pre>
Note: If you want to check the proper output of the above code by using your local server, you have to run the complete code on CMD or XAMPP Shell.

blocks|key|3458471|text|要在代码中单独将字符串"l“和"vv”放在不同的行中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3458472|$xml+=+"l";
$xml+.=+"vv"
echo+$xml;|code-block|syntax|javascript|3458473|在本例中，您的意思是将字符串追加到该字符串变量的前一个版本的末尾。请记住，=只是一个赋值运算符，因此在原始代码中，您将为变量分配一个新的字符串值。|3458474|要将字符串"l“和"vv”单独放在echo中的不同行中，请执行以下操作：|3458475|$xml+=+"l\nvv"
echo+$xml;|3458476|在这个实例中，您不需要多个字符串，因为新行字符\n将为您处理多个字符串。|offset|length|style|CODE|3458477|要在代码中和回显时将字符串"l“和"vv”放在不同的行中：|3458478|$xml+=+"l";
$xml+.=+"\nvv"
echo+$xml;|3458479|entityMap^0|0|0|0|0|0|N|2|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|13|8|@$O|14|P|15|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|V|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

To put the strings "l" and "vv" on separate lines in the code alone:

<pre><code>$xml = "l";
$xml .= "vv"
echo $xml;
</code></pre>

In this instance you're saying to append <code>.=</code> the string to the end of the previous version of that string variable. Remember that = is only an assignment operator so in your original code you're assigning the variable a new string value.

To put the strings "l" and "vv" on separate lines in the echo alone:

<pre><code>$xml = "l\nvv"
echo $xml;
</code></pre>

You don't need multiple strings in this instance, as the new line character <code>\n</code> will take care of that for you.

To put the strings "l" and "vv" on separate lines in code and when echoing:

<pre><code>$xml = "l";
$xml .= "\nvv"
echo $xml;
</code></pre>

blocks|key|3458452|text|$xml="l\rn";
$xml.="vv";

echo+$xml;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3458453|但是你真的应该调查一下http://us3.php.net/simplexml|unstyled|offset|length|3458454|entityMap|0|LINK|mutability|MUTABLE|url|http://us3.php.net/simplexml^0|0|B|S|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@$G|S|H|T|1|U]]|A|$]]|$1|I|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

<pre><code>$xml="l\rn";
$xml.="vv";

echo $xml;
</code></pre>

But you should really look into <a href="http://us3.php.net/simplexml" rel="nofollow">http://us3.php.net/simplexml</a>

Consider:

<pre><code>$xml = "l";
$xml = "vv";

echo $xml;
</code></pre>

This will echo vv. Why and how can I do multi-line strings for things like <a href="https://en.wikipedia.org/wiki/SimpleXML">SimpleXML</a>, etc.?

Multi-line strings in PHP

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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考虑一下：$xml = "l";$xml = "vv";echo $xml;这将回应vv。为什么以及如何为等内容执行多行字符串？

问PHP中的多行字符串
EN

回答 9

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