blocks|key|2642168|text|这是因为您看到的char包含无效的(不存在的)代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2642169|例如，H代码是72。~72是-73。|offset|length|style|CODE|2642170|只要它不是有效的字符，并且不能显示-它显示为一个带问号的正方形。因此，它不能被翻译回来，因为你不能用code+-73复制char+(或者更准确地说，你的记事本或操作系统不能做到这一点)|2642171|entityMap^0|0|3|1|7|2|A|3|E|3|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]|$D|P|E|Q|F|G]|$D|R|E|S|F|G]|$D|T|E|U|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|V|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|K|$]]

That happens because the char you see has invalid (non existent) code.

For example <code>H</code> code is <code>72</code>. <code>~72</code> is <code>-73</code>.

As long as it is not valid char and cannot be shown - it is shown as a square with question mark. Thus it cannot be translated back, because you cannot copy char with code -73 (or to be more precise - your notepad or OS cannot do that)

blocks|key|551724|text|Ascii+H是0100+1000或字符72，~H是1011+0111或字符183。这超出了基本的Ascii表128。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|551725|由于PHP没有规定字符串的特定编码，因此生成的字符将取决于脚本的代码页。|551726|这可能是不可打印的字符(因此用�表示)，当您复制/粘贴时，符号�将简单地替换它。|551727|有关将字符串实现为字节数组的更多详细信息，请参阅Php+Strings。|offset|length|551728|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/language.types.string.php#language.types.string.details^0|0|0|0|O|B|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@$H|V|I|W|1|X]]|A|$]]|$1|J|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

Ascii H is 0100 1000 or character 72, ~H is 1011 0111 or character 183. This is beyond the basic Ascii table of 128. 

Given that PHP does not dictate a specific encoding for strings, the character produced will depend on the code page of your script. 

This might be non-printable character (hence represented by �), which are simply replaced by the symbol � when you copy/paste.

See <a href="http://www.php.net/manual/en/language.types.string.php#language.types.string.details" rel="nofollow">Php Strings</a> for more details on the implementation of strings as arrays of bytes.

blocks|key|4257611|text|如前所述，问题在于您试图回显的字符是不可打印的。您可以检查此脚本的各个步骤中发生了什么，以了解如果确实需要存储此脚本并在以后检索它，您可以执行哪些操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4257612|$a+=+"Hello+World";

$b+=+~$a;

$chars+=+unpack("c11chars",+$b);
foreach+($chars+as+$char)+{
++++echo+$char+.+'+=+'+;
++++echo+chr($char)+.+"\n";
}

$out+=+'';
foreach+($chars+as+$char)+{
++++++++$out+.=+pack("c",+$char);
}
echo+~$out;|code-block|syntax|javascript|4257613|输出：|4257614|-73+=+?
-102+=+?
-109+=+?
-109+=+?
-112+=+?
-33+=+?
-88+=+?
-112+=+?
-115+=+?
-109+=+?
-101+=+?
Hello+World|4257615|?是我的回声，因为它们是不可打印的。|offset|length|style|CODE|4257616|entityMap^0|0|0|0|0|0|1|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@$M|X|N|Y|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

As already mentioned, the problem is that the characters you are trying to echo are non-printable. You can examine what is going on in the various steps of this script to see what you can do if you do indeed need to store this and retrieve it later.

<pre><code>$a = "Hello World";

$b = ~$a;

$chars = unpack("c11chars", $b);
foreach ($chars as $char) {
 echo $char . ' = ' ;
 echo chr($char) . "\n";
}

$out = '';
foreach ($chars as $char) {
 $out .= pack("c", $char);
}
echo ~$out;
</code></pre>

Output:

<pre><code>-73 = ?
-102 = ?
-109 = ?
-109 = ?
-112 = ?
-33 = ?
-88 = ?
-112 = ?
-115 = ?
-109 = ?
-101 = ?
Hello World
</code></pre>

The <code>?</code> are what are echoed for me, since they are non-printable.

Simple enough to test:

<pre><code>echo(~~"Hello World"); //Echos Hello World
echo(~"Hello World"); //Echos �����ߨ����
echo(~"�����ߨ����"); //Echos @B@B@B@B@B W@B@B@B@B
</code></pre>

Why does it work properly for the two Nots directly on top of each other, but not for the copied and pasted string output?

I'd guess there's probably some data being lost somewhere, but how can I output the data in such a way that if I copy and paste it into code which finds the bitwise Not of it, it will actually work?

This has been bugging me and some others I know for quite a while!

Why doesn't the bitwise Not ever work on copied/pasted strings?

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。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

简单到可以测试：echo(~~"Hello World"); //Echos Hello Worldecho(~"Hello World"); //Echos �����ߨ����echo(~"�����ߨ����"); //Echos @B@B@B@B@B W@B@B@B@B为什么它可以直接在两个not的顶部正常工作...

问为什么按位不能处理复制/粘贴的字符串？
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问为什么按位不能处理复制/粘贴的字符串？EN