blocks|key|2097007|text|$string+=+'hello+my+name+is+blah+blah+and+wats+yours';
$search_string+=+'blah';

$first_occurence+=+strpos($string+,+$search_string);

If+(int+preg_match($search_string+,+$string+)+>+1)+{
++++echo+"String+found+more+than+once!!!";

++++//+remove+all+occurences+of+searchstring+from+string+excepte+the+first+one
++++$string+=+substr+($string,+0,+$first_occurence+%2B1)+.+str_replace($search_string,+'',+substr+($string,$first_occurence+%2B1));
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2097008|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>$string = 'hello my name is blah blah and wats yours';
$search_string = 'blah';

$first_occurence = strpos($string , $search_string);

If (int preg_match($search_string , $string ) &gt; 1) {
 echo "String found more than once!!!";

 // remove all occurences of searchstring from string excepte the first one
 $string = substr ($string, 0, $first_occurence +1) . str_replace($search_string, '', substr ($string,$first_occurence +1));
}
</code></pre>

blocks|key|5073683|text|您可以检查$variable在$string中的每个匹配项的位置，并检查几个匹配项的位置是否只是在$variable的长度上不同(可能%2B空格)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5073684|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You could check the position of every occurence of $variable in $string, and check if the positions of several occurences just differs in the length of $variable (maybe + whitespaces).

blocks|key|3662489|text|到目前为止，所有的答案都是关于字符串中单词的任何重复。我认为您只是希望删除连续的相同单词。您可以使用preg_replace执行此操作|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3662490|$string+=+'hello+my+name+is+blah+blah+and+wats+yours';

$string+=+preg_replace('/\b(\w%2B)(\s%2B)\\1\s*/',+'\\1\\2',+$string);|code-block|syntax|javascript|3662491|请注意，此函数相当愚蠢，因此将删除有效的短语，如"had+had“。你可以使用白名单和preg_replace_callback来解决这个问题。|3662492|3662493|只需重新阅读您的问题，之前错过了关于“仅限指定单词”的部分。您可以使用不能重复的单词黑名单来执行此操作：|3662494|$string+=+'hello+my+name+is+blah+blah+and+wats+yours.+I+had+had+a+bad+day';

$string+=+preg_replace_callback('/\b(\w%2B)(\s%2B)\\1\s*/i',+function($matches)+{
++++$blacklist+=+array+('blah');

++++if+(in_array(strtolower($matches[1]),+$blacklist))+{
++++++++return+$matches[1]+.+$matches[2];
++++}+else+{
++++++++return+$matches[0];
++++}
},+$string);

//+$string+==+"hello+my+name+is+blah+and+wats+yours.+I+had+had+a+bad+day"|3662495|您可以向$blacklist数组添加多个单词。|3662496|entityMap^0|1E|C|0|0|17|L|0|0|0|0|4|A|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|13|8|@]|D|@]|E|$]]|$1|P|3|Q|5|H|7|14|8|@]|D|@]|E|$I|J]]|$1|R|3|S|5|6|7|15|8|@$9|16|A|17|B|C]]|D|@]|E|$]]|$1|T|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|U|$]]

All the answers so far talk about any duplication of the word in the string. I think you are only looking to remove consecutive identical words. You can do so with <code>preg_replace</code>:

<pre><code>$string = 'hello my name is blah blah and wats yours';

$string = preg_replace('/\b(\w+)(\s+)\\1\s*/', '\\1\\2', $string);
</code></pre>

Note that this function is rather stupid, and so will remove valid phrases like "had had". You could probably work around this using a whitelist and <code>preg_replace_callback</code>.

<hr>

Just re-read your question and previously missed the bit about "specified words only". You can do this with a blacklist of words that must not be duplicated:

<pre><code>$string = 'hello my name is blah blah and wats yours. I had had a bad day';

$string = preg_replace_callback('/\b(\w+)(\s+)\\1\s*/i', function($matches) {
 $blacklist = array ('blah');

 if (in_array(strtolower($matches[1]), $blacklist)) {
 return $matches[1] . $matches[2];
 } else {
 return $matches[0];
 }
}, $string);

// $string == "hello my name is blah and wats yours. I had had a bad day"
</code></pre>

You could add more than one word to the <code>$blacklist</code> array.

blocks|key|1350238|text|这样如何：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1350239|$string+=+'hello+my+name+is+blah+blah+and+wats+yours';
$variable+=+'blah';
$string+=+preg_replace(+'/(\b'.$variable.'\s%2B){2,}/'+,+'\1'+,+$string+);|code-block|syntax|javascript|1350240|允许处理多个变量(例如，您可以遍历多个$variable，也可以创建它们的数组并使用单个preg_replace()调用。|offset|length|style|CODE|1350241|或者只使用str_replace()|1350242|$string+=+'hello+my+name+is+blah+blah+and+wats+yours';
$variable+=+'blah';
$string+=+str_replace(+$variable.'+'.$variable.'+'+,+$variable.'+'+,+$string+);|1350243|entityMap^0|0|0|J|9|18|E|0|5|D|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]|$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@$I|10|J|11|K|L]]|9|@]|A|$]]|$1|O|3|P|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|R|$]]

How about this:

<pre><code>$string = 'hello my name is blah blah and wats yours';
$variable = 'blah';
$string = preg_replace( '/(\b'.$variable.'\s+){2,}/' , '\1' , $string );
</code></pre>

Allows for more than one variable to be handled (ie you could either loop through a number of <code>$variable</code>s or you could create an array of them and use a single <code>preg_replace()</code> call.

Or just use a <code>str_replace()</code>

<pre><code>$string = 'hello my name is blah blah and wats yours';
$variable = 'blah';
$string = str_replace( $variable.' '.$variable.' ' , $variable.' ' , $string );
</code></pre>

Say you have a string like:

<pre><code> $string = 'hello my name is blah blah and wats yours';
</code></pre>

And you wanted to go through and check for any places where there might be a duplication.. not of any word, but just of the chosen word in this instance 'blah'. 

<pre><code> $variable = 'blah';
</code></pre>

Ie, if 'blah' appears back to back - remove one of them.

I consider splitting the string into an array and if one variable in the array starts with the same word the last one ended with then cut out one and rebuild the string. Seems tedius so this is why I am asking if there might be a simpler way.

Any ideas?

edit: i just realised i didn't consider doing a preg_match of simply 'blah blah' with 'blah'.

Removing a duplication of a variable in 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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假设你有这样一个字符串：  $string = 'hello my name is blah blah and wats yours';你想检查所有可能有复制品的地方..不是任何单词，而是本例中所选的单词“blah”。   $variable = 'blah';也就是说，如果“blah”背靠背出现--删除其中一个。我考...

问删除字符串中变量的重复项？
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问删除字符串中变量的重复项？EN