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PHP: Extract File Extension of a File

Question by Compi | 2015-07-07 at 18:01

I would like to extract the fileextension of an arbitrary file with the help of PHP, for example to determine the format of an upload.

Does someone know a simple PHP function for this? Reluctantly, I would like to work with the string functions such as substr, explode, implode, split or something else. There must be something simple!

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0Best Answer0 Votes

Yes. There is actually a very easy way. It is called pathinfo. Let us look at a small example: 

$filename = "/www/htdocs/test.txt";

$ext = pathinfo($filename, PATHINFO_EXTENSION);

echo $ext;

Here, we are using pathinfo() for reading out the file extension of the file in $filename. As first parameter, the function is expecting the filename and as second parameter a constant depending on what you would like to read out. Possible are PATHINFO_DIRNAME, PATHINFO_BASENAME, PATHINFO_EXTENSION and PATHINFO_FILENAME.

If you omit the second parameter, an array containing all information is build. You can find an example for this in the topic about how to split a file path using PHP into its complements such as path, filename and file extension.
2015-07-07 at 18:39

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