Get extension from filename like variable [duplicate]

This question already has answers here: Closed 10 years ago.

Possible Duplicate:

How to extract a file extension in PHP?

I have a variable $filename="filename.ext" or $filename="filena.m.e.ext" or so on.. How开发者_StackOverflow can i extract the extension (here ext) from the variable / string? The variable may change or may have more than one dots.. In that case, i want to get the part after the last dot..

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see the answer :

$ext = pathinfo($filename, PATHINFO_EXTENSION);

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You can use the path info interrogation.

$info = pathinfo($file);

where

$info['extension']

contains the extension

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you could define a function like this:

function get_file_extension($filename)
{
    /*
     * "." for extension should be available and not be the first character
     * so position should not be false or 0.
     */
    $lastDotPos = strrpos($fileName, '.');
    if ( !$lastDotPos ) return false;
    return substr($fileName, $lastDotPos+1);
}

or you could use the Spl_FileInfo object built into PHP

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You want to use a regular expression:

preg_match('/\.([^\.]+)$/', $filename);

You can test it out here to see if it gets you the result you want given your input.

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There are many ways to do this, ie with explode() or with a preg_match and others.

But the way I do this is with pathinfo:

$path_info = pathinfo($filename);

echo $path_info['extension'], "\n";

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You could explode the string using ., then take the last array item:

$filename = "file.m.e.ext";
$filenameitems = explode(".", $filename);

echo $filenameitems[count($filenameitems) - 1]; // .ext
// or echo $filenameitem[-1];