blocks|key|860510|text|$name+=+str_replace('+',+'_',+$name);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|860511|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>$name = str_replace(' ', '_', $name);
</code></pre>

blocks|key|643531|text|正如其他人已经解释了如何使用str_replace来实现这一点，您也可以使用正则表达式来实现这一点。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|643532|$name+=+preg_replace('/\s%2B/',+'_',+$name);|code-block|syntax|javascript|643533|entityMap^0|E|B|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

As of others have explained how to do it using <code>str_replace</code>, you can also use regex to achieve this.

<pre><code>$name = preg_replace('/\s+/', '_', $name);
</code></pre>

blocks|key|643400|text|$name+=+str_replace('+',+'_',+$name);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|643401|http://php.net/manual/en/function.str-replace.php|unstyled|offset|length|643402|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1D|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|Q|8|@]|9|@$G|R|H|S|1|T]]|A|$]]|$1|I|3|-4|5|F|7|U|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|E]]]]

<pre><code>$name = str_replace(' ', '_', $name);
</code></pre>

<a href="http://php.net/manual/en/function.str-replace.php">http://php.net/manual/en/function.str-replace.php</a>

blocks|key|643317|text|使用PHP的str_replace函数。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|643318|类似于：|643319|$str+=+str_replace('+',+'_',+$str);|code-block|syntax|javascript|643320|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.str-replace.php^0|6|B|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

Use <a href="http://php.net/manual/en/function.str-replace.php" rel="noreferrer">str_replace</a> function of PHP.

Something like:

<pre><code>$str = str_replace(' ', '_', $str);
</code></pre>

blocks|key|860611|text|调用http://php.net/str_replace：$input+=+str_replace('+',+'_',+$input);|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|860612|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/str_replace^0|T|13|2|Q|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

Call <a href="http://php.net/str_replace" rel="noreferrer">http://php.net/str_replace</a>: <code>$input = str_replace(' ', '_', $input);</code>

blocks|key|860622|text|使用str_replace|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|860623|str_replace("+","_","Alex+Newton");|code-block|syntax|javascript|860624|entityMap|0|LINK|mutability|MUTABLE|url|http://fi2.php.net/str_replace^0|2|B|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Use <a href="http://fi2.php.net/str_replace" rel="noreferrer">str_replace</a>:

<pre><code>str_replace(" ","_","Alex Newton");
</code></pre>

blocks|key|643588|text|您还可以这样做，以防止单词以下划线开头或结尾，如_words_more_words_，这将避免以空格开头和结尾。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|643589|$trimmed+=+trim($string);+//+Trims+both+ends
$convert+=+str_replace('',+'_',+$trimmed);|code-block|syntax|javascript|643590|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can also do this to prevent the words from beginning or ending with underscores like _words_more_words_, This would avoid beginning and ending with white spaces.

<pre><code>$trimmed = trim($string); // Trims both ends
$convert = str_replace('', '_', $trimmed);
</code></pre>

blocks|key|643701|text|你可以使用str_replace，比如你的名字在变量$name中|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|643702|$result+=+str_replace('+',+'_',+$name);|code-block|syntax|javascript|643703|另一种方法是使用正则表达式，因为它将有助于消除2-time+space等。|643704|++$result=++preg_replace('/\s%2B/',+'_',+$name);|643705|entityMap^0|5|B|Q|5|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

you can use <code>str_replace</code> say your name is in variable <code>$name</code>

<pre><code>$result = str_replace(' ', '_', $name);
</code></pre>

another way is to use regex, as it will help to eliminate 2-time space etc.

<pre><code> $result= preg_replace('/\s+/', '_', $name);
</code></pre>

blocks|key|643464|text|这是我的代码的一部分，它将空格作为下划线来命名我的文件：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|643465|$file+=+basename($_FILES['upload']['name']);
$file+=+str_replace('+','_',$file);|code-block|syntax|javascript|643466|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is part of my code which makes spaces into underscores for naming my files:

<pre><code>$file = basename($_FILES['upload']['name']);
$file = str_replace(' ','_',$file);
</code></pre>

blocks|key|643607|text|我就是这样用的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|643608|$option+=+trim($option);
$option+=+str_replace('+',+'_',+$option);|code-block|syntax|javascript|643609|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I used like this

<pre><code>$option = trim($option);
$option = str_replace(' ', '_', $option);
</code></pre>

blocks|key|643653|text|Strtr替换了单个字符而不是字符串，因此对于这个示例来说，它是一个很好的解决方案。据推测，strtr比str_replace快(但在这个用例中，它们都快得不可估量)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|643654|echo+strtr('Alex+Newton','+','_');
//outputs:+Alex_Newton|code-block|syntax|javascript|643655|entityMap^0|0|5|1A|5|1G|B|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

<code>Strtr</code> replaces single characters instead of strings, so it's a good solution for this example. Supposedly <code>strtr</code> is faster than <code>str_replace</code> (but for this use case they're both immeasurably fast). 

<pre><code>echo strtr('Alex Newton',' ','_');
//outputs: Alex_Newton
</code></pre>

blocks|key|860971|text|str_replace+-这是显而易见的解决方案。但有时你需要知道这些空间到底是什么。我对csv文件中的空格有问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|860972|有两个字符，但其中一个是0160+(0x0A0)，另一个是不可见的(0x0C2)|860973|我的最终解决方案是：|860974|$str+=+preg_replace('/\xC2\xA0%2B/',+'',+$str);|code-block|syntax|javascript|860975|我从mc的十六进制查看器中找到了不可见的符号(午夜查看器-+F3+-+F9)|860976|entityMap^0|0|B|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|W|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|X|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|Y|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|R|$]]

<code>str_replace</code> - it is evident solution. But sometimes you need to know what exactly the spaces there are. I have a problem with spaces from csv file.

There were two chars but one of them was 0160 (0x0A0) and other was invisible (0x0C2)

my final solution:

<pre><code>$str = preg_replace('/\xC2\xA0+/', '', $str);
</code></pre>

I found the invisible symbol from HEX viewer from mc (midnight viewer - F3 - F9)

blocks|key|861019|text|如果你有一个参数$string并想要替换它，只需用下划线(_)即可。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|861020|$string+=+"Hello+All.";
$newString+=+str_replace('+',+'_',+$string);|code-block|syntax|javascript|861021|输出将为Hello_All.|861022|entityMap^0|8|7|0|0|4|A|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

if you have a parameter <code>$string</code> and want to replace it's apace to underscore(_).
<pre><code>$string = &quot;Hello All.&quot;;
$newString = str_replace(' ', '_', $string);
</code></pre>
output will be <code>Hello_All.</code>

I have a PHP Script that users will enter a name like: <code>Alex_Newton</code>,

However, some users will use a space rather than an underscore, so my question is:

How do I auto-replace spaces with Underscores in PHP?

Replacing Spaces with Underscores

我有一个PHP脚本，用户可以输入如下名称：Alex_Newton，然而，一些用户会使用空格而不是下划线，所以我的问题是：如何在PHP中自动将空格替换为下划线？

问用下划线替换空格
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