blocks|key|1505097|text|在现代操作系统中，文件名很可能在文件扩展名之前很长时间包含句点，例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1505098|my.file.name.jpg|code-block|syntax|javascript|1505099|PHP提供了一种方法来查找不带扩展名的文件名，然后只需添加新的扩展名即可：|1505100|function+replace_extension($filename,+$new_extension)+{
++++$info+=+pathinfo($filename);
++++return+$info['filename']+.+'.'+.+$new_extension;
}|1505101|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In modern operating systems, filenames very well might contain periods long before the file extension, for instance:

<pre><code>my.file.name.jpg
</code></pre>

PHP provides a way to find the filename without the extension that takes this into account, then just add the new extension:

<pre><code>function replace_extension($filename, $new_extension) {
 $info = pathinfo($filename);
 return $info['filename'] . '.' . $new_extension;
}
</code></pre>

blocks|key|1720173|text|substr_replace($file+,+'png',+strrpos($file+,+'.')+%2B1)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1720174|会将任何扩展名更改为您想要的。用你想要的扩展名替换png。|unstyled|1720175|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>substr_replace($file , 'png', strrpos($file , '.') +1)
</code></pre>

Will change any extension to what you want. Replace png with what ever your desired extension would be.

blocks|key|1720371|text|替换扩展名，保留路径信息|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1720372|function+replace_extension($filename,+$new_extension)+{
++++$info+=+pathinfo($filename);
++++return+($info['dirname']+?+$info['dirname']+.+DIRECTORY_SEPARATOR+:+'')+
++++++++.+$info['filename']+
++++++++.+'.'+
++++++++.+$new_extension;
}|code-block|syntax|javascript|1720373|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|$]]

<h2>Replace extension, keep path information</h2>

<pre><code>function replace_extension($filename, $new_extension) {
 $info = pathinfo($filename);
 return ($info['dirname'] ? $info['dirname'] . DIRECTORY_SEPARATOR : '') 
 . $info['filename'] 
 . '.' 
 . $new_extension;
}
</code></pre>

blocks|key|1719956|text|http://www.php.net/rename|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1719957|entityMap|0|LINK|mutability|MUTABLE|url^0|0|P|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@$A|L|B|M|1|N]]|C|$]]|$1|D|3|-4|5|6|7|O|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|4]]]]

<a href="http://www.php.net/rename" rel="noreferrer">http://www.php.net/rename</a>

blocks|key|1720018|text|将文件名放入字符串后，首先使用regex将扩展名替换为您选择的扩展名。下面是一个可以做到这一点的小函数：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1720019|function+replace_extension($filename,+$new_extension)+{
++++return+preg_replace('/\..%2B$/',+'.'+.+$new_extension,+$filename);
}|code-block|syntax|javascript|1720020|然后使用rename()函数将该文件重命名为新的文件名。|offset|length|1720021|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/rename^0|0|0|4|8|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]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Once you have the filename in a string, first use regex to replace the extension with an extension of your choice. Here's a small function that'll do that:

<pre><code>function replace_extension($filename, $new_extension) {
 return preg_replace('/\..+$/', '.' . $new_extension, $filename);
}
</code></pre>

Then use the <a href="http://php.net/rename" rel="noreferrer">rename()</a> function to rename the file with the new filename.

blocks|key|1720290|text|只需用regexp替换它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1720291|$filename+=+preg_replace('"\.bmp$"',+'.jpg',+$filename);|code-block|syntax|javascript|1720292|您还可以扩展此代码以删除其他图像扩展名，而不仅仅是bmp：|1720293|$filename+=+preg_replace('"\.(bmp%7Cgif)$"',+'.jpg',+$filename);|1720294|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Just replace it with regexp:

<pre><code>$filename = preg_replace('"\.bmp$"', '.jpg', $filename);
</code></pre>

You can also extend this code to remove other image extensions, not just bmp:

<pre><code>$filename = preg_replace('"\.(bmp|gif)$"', '.jpg', $filename);
</code></pre>

blocks|key|1505316|text|对于正则表达式的粉丝们，将始终包含新扩展名(这样，如果您编写了一个文件转换程序，您就不会意外地用结果覆盖源文件)的Thanh+Trung+'preg_replace‘解决方案的修改版本是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1505317|preg_replace('/\.[%5E.]%2B$/',+'.',+$file)+.+$extension|code-block|syntax|javascript|1505318|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|$]]

For regex fans,
modified version of Thanh Trung's 'preg_replace' solution that will always contain the new extension (so that if you write a file conversion program, you won't accidentally overwrite the source file with the result) would be:

<pre><code>preg_replace('/\.[^.]+$/', '.', $file) . $extension
</code></pre>

blocks|key|1505352|text|更好的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1505353|substr($filename,+0,+-strlen(pathinfo($filename,+PATHINFO_EXTENSION))).$new_extension|code-block|syntax|javascript|1505354|仅在扩展部件上进行更改。保留其他信息不变。|1505355|这是安全的。|1505356|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Better way:

<pre><code>substr($filename, 0, -strlen(pathinfo($filename, PATHINFO_EXTENSION))).$new_extension
</code></pre>

Changes made only on extension part. Leaves other info unchanged.

It's safe.

blocks|key|1505387|text|您可以使用basename()|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1505388|$oldname+=+'path/photo.jpg';
$newname+=+(dirname($oldname)+?+dirname($oldname)+.+DIRECTORY_SEPARATOR++:+'')+.+basename($oldname,+'jpg')+.+'exe';|code-block|syntax|javascript|1505389|或者对于所有分机：|1505390|$newname+=+(dirname($oldname)+?+dirname($oldname)+.+DIRECTORY_SEPARATOR++:+'')+.+basename($oldname,+pathinfo($path,+PATHINFO_EXTENSION))+.+'exe';|1505391|最后使用rename()|1505392|rename($oldname,+$newname);|1505393|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.basename.php|1|http://php.net/manual/en/function.rename.php^0|5|A|0|0|0|0|0|4|8|1|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|F|7|14|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|15|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|16|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|17|8|@]|9|@$A|18|B|19|1|1A]]|C|$]]|$1|O|3|P|5|F|7|1B|8|@]|9|@]|C|$G|H]]|$1|Q|3|-4|5|6|7|1C|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]|Y|$5|T|U|V|C|$W|Z]]]]

You could use <a href="http://php.net/manual/en/function.basename.php" rel="nofollow noreferrer">basename()</a>:

<pre><code>$oldname = 'path/photo.jpg';
$newname = (dirname($oldname) ? dirname($oldname) . DIRECTORY_SEPARATOR : '') . basename($oldname, 'jpg') . 'exe';
</code></pre>

Or for all extensions:

<pre><code>$newname = (dirname($oldname) ? dirname($oldname) . DIRECTORY_SEPARATOR : '') . basename($oldname, pathinfo($path, PATHINFO_EXTENSION)) . 'exe';
</code></pre>

Finally use <a href="http://php.net/manual/en/function.rename.php" rel="nofollow noreferrer">rename()</a>:

<pre><code>rename($oldname, $newname);
</code></pre>

blocks|key|1720114|text|我需要这个来改变所有带有图库的图片扩展名为小写。我最终做了以下几件事：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1720115|//+Converts+image+file+extensions+to+all+lowercase
$currentdir+=+opendir($gallerydir);
while(false+!==+($file+=+readdir($currentdir)))+{
++if(strpos($file,'.JPG',1)+%7C%7C+strpos($file,'.GIF',1)+%7C%7C+strpos($file,'.PNG',1))+{
++++$srcfile+=+"$gallerydir/$file";
++++$filearray+=+explode(".",$file);
++++$count+=+count($filearray);
++++$pos+=+$count+-+1;
++++$filearray[$pos]+=+strtolower($filearray[$pos]);
++++$file+=+implode(".",$filearray);
++++$dstfile+=+"$gallerydir/$file";
++++rename($srcfile,$dstfile);
++}
}|code-block|syntax|javascript|1720116|这对我的目的很有效。|1720117|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 needed this to change all images extensions withing a gallery to lowercase. I ended up doing the following:

<pre><code>// Converts image file extensions to all lowercase
$currentdir = opendir($gallerydir);
while(false !== ($file = readdir($currentdir))) {
 if(strpos($file,'.JPG',1) || strpos($file,'.GIF',1) || strpos($file,'.PNG',1)) {
 $srcfile = "$gallerydir/$file";
 $filearray = explode(".",$file);
 $count = count($filearray);
 $pos = $count - 1;
 $filearray[$pos] = strtolower($filearray[$pos]);
 $file = implode(".",$filearray);
 $dstfile = "$gallerydir/$file";
 rename($srcfile,$dstfile);
 }
}
</code></pre>

This worked for my purposes.

How can I change a file's extension using PHP?

Ex: photo.jpg to photo.exe

How can I change a file's extension using PHP?

如何使用PHP更改文件的扩展名？例如:从photo.jpg到photo.exe

问如何使用PHP更改文件的扩展名？
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问如何使用PHP更改文件的扩展名？
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