blocks|key|3079775|text|$str+=+str_replace('+','',$str);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3079776|或者，替换为下划线、&+nbsp；等。|unstyled|3079777|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

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

Or, replace with underscore, &amp; nbsp; etc etc.

blocks|key|323828|text|$str+=+preg_replace('/[\s]%2B/',+'+',+$str);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|323829|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>$str = preg_replace('/[\s]+/', ' ', $str);
</code></pre>

blocks|key|326295|text|$str+=+trim(preg_replace('/\s%2B/','+',+$str));|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|326296|上面的代码行将删除额外的空格以及前导空格和尾随空格。|326297|entityMap^0|0|19|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

<code>$str = trim(preg_replace('/\s+/',' ', $str));</code>

The above line of code will remove extra spaces, as well as leading and trailing spaces.

blocks|key|328679|text|为了扩展桑迪普的答案，我在bit.ly中错误编码的日志中显示了一堆字符串。他们打算只对URL进行编码，但在空格后面添加了twitter句柄和其他一些东西。它看起来像这样|type|unstyled|depth|inlineStyleRanges|entityRanges|data|328680|?+productID+=26%2520via%2520@LFS|code-block|syntax|javascript|328681|通常，这不是问题，但是我收到了很多SQL注入尝试，所以我将任何无效ID重定向到404。我使用preg_replace方法将无效的productID字符串转换为有效的productID。|328682|$productID=preg_replace('/[\s]%2B.*/','',$productID);|328683|我在URL中查找空格，然后删除它后面的所有内容。|328684|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]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

To expand on Sandip’s answer, I had a bunch of strings showing up in the logs that were mis-coded in bit.ly. They meant to code just the URL but put a twitter handle and some other stuff after a space. It looked like this

<pre><code>? productID =26%20via%20@LFS
</code></pre>

Normally, that would‘t be a problem, but I’m getting a lot of SQL injection attempts, so I redirect anything that isn’t a valid ID to a 404. I used the preg_replace method to make the invalid productID string into a valid productID.

<pre><code>$productID=preg_replace('/[\s]+.*/','',$productID);
</code></pre>

I look for a space in the URL and then remove everything after it.

blocks|key|3293237|text|其他例子对我都不起作用，所以我用了这个例子：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3293238|trim(preg_replace('/[\t\n\r\s]%2B/',+'+',+$text_to_clean_up))|code-block|syntax|javascript|3293239|这会将所有制表符、换行符、双空格等替换为简单的1个空格。|3293240|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|$]]

none of other examples worked for me, so I've used this one:

<pre><code>trim(preg_replace('/[\t\n\r\s]+/', ' ', $text_to_clean_up))
</code></pre>

this replaces all tabs, new lines, double spaces etc to simple 1 space.

blocks|key|3293242|text|如果您只想替换字符串中的多个空格，例如："this+string++++++++++++++++++++++++have+lots+of++++++++++++++++++++++++space++.+++"，并且您希望答案是"this+string+have+lots+of+space"，则可以使用以下解决方案：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3293243|$strng+=+"this+string++++++++++++++++++++++++have+lots+of++++++++++++++++++++++++space++.+++";

$strng+=+trim(preg_replace('/\s%2B/','+',+$strng));

echo+$strng;|code-block|syntax|javascript|3293244|entityMap^0|K|2C|35|W|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

If you want to replace only multiple spaces in a string, for Example: <code>"this string have lots of space . "</code>
And you expect the answer to be 
<code>"this string have lots of space"</code>, you can use the following solution:

<pre><code>$strng = "this string have lots of space . ";

$strng = trim(preg_replace('/\s+/',' ', $strng));

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

blocks|key|325617|text|如果您从用户输入或其他不受信任的来源获得有效负载，则使用preg_replace()会存在安全缺陷。PHP使用eval()执行正则表达式。如果传入的字符串没有经过适当的清理，您的应用程序可能会受到代码注入的影响。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|325618|在我自己的应用程序中，我没有麻烦地清理输入(因为我只处理短字符串)，相反，我做了一个稍微占用更多处理器的函数，尽管它是安全的，因为它不会对任何东西进行eval()。|325619|function+secureRip(string+$str):+string+{+/*+Rips+all+whitespace+securely.+*/
++$arr+=+str_split($str,+1);
++$retStr+=+'';
++foreach+($arr+as+$char)+{
++++$retStr+.=+trim($char);
++}
++return+$retStr;
}|code-block|syntax|javascript|325620|entityMap^0|2Q|4|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

There are security flaws to using preg_replace(), if you get the payload from user input [or other untrusted sources]. PHP executes the regular expression with eval(). If the incoming string isn't properly sanitized, your application risks being subjected to code injection.

In my own application, instead of bothering sanitizing the input (and as I only deal with short strings), I instead made a slightly more processor intensive function, though which is secure, since it doesn't eval() anything.

<pre><code>function secureRip(string $str): string { /* Rips all whitespace securely. */
 $arr = str_split($str, 1);
 $retStr = '';
 foreach ($arr as $char) {
 $retStr .= trim($char);
 }
 return $retStr;
}
</code></pre>

blocks|key|326372|text|您可以使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|326373|$str+=+trim(str_replace("++",+"+",+$str));|code-block|syntax|javascript|326374|此从字符串的两边删除多余的空格，将字符串中的两个空格转换为一个。请注意，这不会将一行中的三个或更多空格转换为一个空格！我可以建议的另一种方式是使用内爆和爆炸，这是更安全的，但完全不是最佳的！|offset|length|style|BOLD|326375|$str+=+implode("+",+array_filter(explode("+",+$str)));|326376|我的建议是使用本机for循环或使用正则表达式来完成这类工作。|326377|entityMap^0|0|0|1|E|G|F|0|0|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]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]|$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

You can use:

<pre><code>$str = trim(str_replace(" ", " ", $str));
</code></pre>

This removes extra whitespaces from both sides of string and converts two spaces to one within the string. Note that this won't convert three or more spaces in a row to one!
Another way I can suggest is using implode and explode that is safer but totally not optimum!

<pre><code>$str = implode(" ", array_filter(explode(" ", $str)));
</code></pre>

My suggestion is using a native for loop or using regex to do this kind of job.

blocks|key|3293384|text|$str+=+"I++++++am+a+PHP+++Developer";
$str_length+=+strlen($str);
$str_arr+=+str_split($str);
for+($i+=+0;+$i+<+$str_length;+$i%2B%2B)+{
+++if+(isset($str_arr[$i+%2B+1])++&&+$str_arr[$i]+==+'+'+&&+$str_arr[$i]+==+$str_arr[$i+%2B+1])+{
+++++++unset($str_arr[$i]);
+++}+
+++else+{
+++++continue;
+++}
}
echo+implode("",+$str_arr);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3293385|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>$str = "I am a PHP Developer";
$str_length = strlen($str);
$str_arr = str_split($str);
for ($i = 0; $i &lt; $str_length; $i++) {
 if (isset($str_arr[$i + 1]) &amp;&amp; $str_arr[$i] == ' ' &amp;&amp; $str_arr[$i] == $str_arr[$i + 1]) {
 unset($str_arr[$i]);
 } 
 else {
 continue;
 }
}
echo implode("", $str_arr);
</code></pre>

blocks|key|328770|text|我最近写了一个简单的函数，可以删除字符串中多余的空格，而不使用正则表达式implode('+',+array_filter(explode('+',+$str)))。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|328771|entityMap^0|10|1A|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

I wrote recently a simple function which removes excess white space from string without regular expression <code>implode(' ', array_filter(explode(' ', $str)))</code>.

I receive a string from a database query, then I remove all HTML tags, carriage returns and newlines before I put it in a CSV file. Only thing is, I can't find a way to remove the excess white space from between the strings.

What would be the best way to remove the inner whitespace characters?

Remove excess whitespace from within a string

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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我从数据库查询中收到一个字符串，然后在将其放入CSV文件之前删除所有HTML标记、回车符和换行符。唯一的问题是，我找不到一种方法来删除字符串之间的多余的空白。删除内部空格字符的最佳方法是什么？

问从字符串中删除多余的空格
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