blocks|key|2539839|text|是的，退格字符是ASCII字符代码8(根据ASCII表)，所以您可以使用chr()以php格式输出它。例：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2539840|echo+'ab'+.+chr(8);|code-block|syntax|javascript|2539841|输出"a“|2539842|entityMap|0|LINK|mutability|MUTABLE|url|http://www.asciitable.com/|1|http://php.net/chr^0|L|6|0|10|5|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]|$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|12|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

Yes, the backspace character is ASCII character code 8 (According to the <a href="http://www.asciitable.com/" rel="noreferrer">ASCII table</a>), so you can output it in php using <a href="http://php.net/chr" rel="noreferrer">chr()</a>. eg:

<pre><code>echo 'ab' . chr(8);
</code></pre>

will output "a"

blocks|key|1013858|text|如果输出目标是HTML，那么额外的空格并不重要--浏览器不会呈现多个相邻的空间(这就是为什么我们有&nbsp;)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1013859|如果输出目标是其他东西，那么您可以简单地清理输出。正如你从其他回复中看到的，有很多方法可以做到这一点。似乎您正在使用echo语句，因此输出缓冲函数将是您想要使用的路线。|1013860|ob_start();

echo+"Hello+\n";
echo+"World!";

$output+=+preg_replace(+"/+%2B/",+'+',+str_replace(+"\n",+'+',+ob_get_clean()+)+);

echo+$output;|code-block|syntax|javascript|1013861|entityMap|0|LINK|mutability|MUTABLE|url|http://us3.php.net/manual/en/book.outcontrol.php^0|1D|6|0|1V|4|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@$9|Y|A|Z|1|10]]|E|$]]|$1|H|3|I|5|J|7|11|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

If the output target is HTML then extra spaces don't matter - browsers don't render multiple, contiguous spaces (which is why we have <code>&amp;nbsp;</code>)

If the output target is something else, then you can simply cleanup the output. As you can see from other replies, there are a myriad of ways to do this. It seems like you're working with echo statements so the <a href="http://us3.php.net/manual/en/book.outcontrol.php" rel="noreferrer">output-buffering</a> functions will be the route you want to take.

<pre><code>ob_start();

echo "Hello \n";
echo "World!";

$output = preg_replace( "/ +/", ' ', str_replace( "\n", ' ', ob_get_clean() ) );

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

blocks|key|1038651|text|如果您想做任何事情，可以使用输出缓冲区：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1038652|ob_start();

echo+"Hello\n+World";

$out+=+ob_get_contents();

ob_end_clear();
echo+str_replace('\n',+'',+$out);|code-block|syntax|javascript|1038653|您甚至可以使用httaccess将包含此内容的脚本追加到任何调用的脚本中。|1038654|然而，你就不能在它被设定为标准之前处理它吗？喜欢|1038655|function+print2($str){
++++echo+str_replace("\n",+'',+$str);
}|1038656|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

If you wanted to be able to do it for anything you could use the output buffer:

<pre><code>ob_start();

echo "Hello\n World";

$out = ob_get_contents();

ob_end_clear();
echo str_replace('\n', '', $out);
</code></pre>

You could even use httaccess to append scripts containing this to any script called.

However, couldn't you just deal with it before it is set to stdout? Like

<pre><code>function print2($str){
 echo str_replace("\n", '', $str);
}
</code></pre>

blocks|key|1013943|text|这不是对他的确切问题的直接回答，而是对标题似乎暗示的:输出PHP+"backspace“字符，这可能只有在使用PHP时才有用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1013944|您可以在ASCII表上为这个(和其他字符)找到正确的ASCII代码，然后使用chr()或转义序列：|offset|length|1013945|echo+chr(8);
echo+"\010";|code-block|syntax|javascript|1013946|entityMap|0|LINK|mutability|MUTABLE|url|http://www.asciitable.com/|1|http://us2.php.net/manual/en/function.chr.php^0|0|4|6|0|12|5|1|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]|$D|Z|E|10|1|11]]|A|$]]|$1|F|3|G|5|H|7|12|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]|S|$5|N|O|P|A|$Q|T]]]]

This is not a direct answer to his exact question, but to what the title seems to allude to: outputting a PHP "backspace" character, which is probably only useful when using the PHP CLI.

You can find the right ASCII code for this (and other characters) on the <a href="http://www.asciitable.com/" rel="nofollow">ASCII table</a>, and then use either <a href="http://us2.php.net/manual/en/function.chr.php" rel="nofollow">chr()</a> or an escape sequence:

<pre><code>echo chr(8);
echo "\010";
</code></pre>

blocks|key|1037443|text|如果您的传入字符串中已经有一个空格，那么只需将"\n“替换为空白(或者什么也不需要)如何？|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1037444|例如，就像这样：|1037445|$str+=+"Hello\nWorld!";
var_dump($str);

$str+=+str_replace("\n",+'+',+$str);
var_dump($str);|code-block|syntax|javascript|1037446|第一个输出提供：|1037447|string+'Hello
World!'+(length=12)|1037448|第二个是：|1037449|string+'HelloWorld!'+(length=11)|1037450|这还不够吗？|1037451|(或者我可能不太明白这个问题)|1037452|entityMap^0|O|2|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|13|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|14|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|15|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|16|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|17|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|18|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|6|7|19|8|@]|D|@]|E|$]]|$1|W|3|X|5|6|7|1A|8|@]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|Z|$]]

What about just replacing the "<code>\n</code>" by a white space (or just nothing, if you already have one space in your incoming string) ?

Like this, for instance :

<pre><code>$str = "Hello\nWorld!";
var_dump($str);

$str = str_replace("\n", ' ', $str);
var_dump($str);
</code></pre>

The first output gives :

<pre><code>string 'Hello
World!' (length=12)
</code></pre>

And the second one :

<pre><code>string 'HelloWorld!' (length=11)
</code></pre>

Is that not enough ?
 (Or maybe I don't understand the question well)

blocks|key|1013738|text|你就不能这样做吗|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1013739|$str+=+str_replace("\n",+'+',+$str);
while+(strpos($str,+'++')+!==+false)+//+while+there's+two+spaces+in+a+row
++$str+=+str_replace('++',+'+',+$str);|code-block|syntax|javascript|1013740|现在，$str将只将每个空格或\n字符序列替换为一个空格。(因为如果您只删除\n您就会有一个空格丢失的地方，如果您只是用一个空格替换它，您就会在一行中有多个空格)。|offset|length|style|CODE|1013741|编辑:我不知道这个循环是否真的有必要，但我在这里没有任何测试，str_replace是否会自动完成这个任务(而且我不认为将regexp用于如此简单的事情确实是一个好主意)。|1013742|entityMap^0|0|0|3|4|F|2|0|V|B|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]|$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@$I|Y|J|Z|K|L]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|P|$]]

Can't you do it like this:

<pre><code>$str = str_replace("\n", ' ', $str);
while (strpos($str, ' ') !== false) // while there's two spaces in a row
 $str = str_replace(' ', ' ', $str);
</code></pre>

Now <code>$str</code> will have every spaces or <code>\n</code> characters sequences replaced by only one space.
(because if you just remove \n you migth have some place where a space is missing, and if you just replace it by a space you'll have some places with multiple spaces in a row).

EDIT: i don't know if the loop is really necessary but i don't have anything to test here if <code>str_replace</code> will automatically do the trick (and i don't think using regexp for such a simple thing is really a good idea).

blocks|key|1013884|text|与其考虑如何做一个后置字符，我建议重新思考这个问题。你为什么要收回你的一些产出？可能是因为你太早把它输出了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1013885|与其对中间值执行回显，不如将它们附加到缓冲区中。然后编辑缓冲区。然后打印出来。如果无法控制输出是否生成(例如，您使用的是外部供应商的输出库，请使用PHP输出缓冲)。|1013886|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Instead of thinking about how to do a backspace character, I would suggest rethinking the problem. Why do you want to take back some of your output? Probably because you outputted it too early. 

Instead of doing an echo on the intermediary values, append them to the buffer. Then edit the buffer. Then print it out. If you can't control whether the output is produced or not (for example, you're using external vendor's library that outputs stuff), use PHP output buffering.

blocks|key|1013904|text|我不知道如何做一个后台，但如果您只是尝试做一个新的行，我会使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1013905|echo+" ";|code-block|syntax|javascript|1013906|PHP代码允许html代码，只要它在打印或回显语句中使用，并且在双引号中。|1013907|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|$]]

I don't know how to do a backspace, but if you are just trying to do a new line I would use:

<pre><code>echo "&lt;br&gt;";
</code></pre>

PHP code allows for html code as long as it is used in a print or echo statement and is inside double quotes.

I have a feeling the answer is "it's not possible," but thought I'd ask to satisfy my curiosity.

I have some code that's echoed where the \n is unavoidable:

<pre><code>echo "Hello \n";
echo "World!";
</code></pre>

I'd like the line to simply read (in the code output):

<blockquote>
 Hello World!
</blockquote>

... thus removing the \n.

So I was wondering if it's possible to execute a "backspace" character during PHP's output?

Something simple like <code>str_replace( "\n", 'backspace-character', $str );</code>

PHP "backspace" character during output possible?

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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我有一种感觉，答案是“这是不可能的”，但我想我会要求满足我的好奇心。我有一些代码被回覆到\n不可避免的地方：echo "Hello \n";echo "World!";我想让这一行简单地读(在代码输出中)：你好，世界！..。从而删除\n。所以我想知道在PHP输出过程中是否可以执行一个"backspace“字符？像str_replace( "\n", 'backspace-character', $

问PHP "backspace“字符在输出过程中可能吗？
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