finding last 3-4 character

[skc]

Hi All,
I want to find the last 3or 4 character from some string. this string might be like "abc.gif" or "abc.jpg" or abc.swf". I want to find out if this is ".swf" or ".gif" or ".jpg".
I need the help for this

skc

[dotnotwhat]

Hi. This should do the trick.

Filename may not have an extension, or it's extension could be virtually any number of characters in length, so don't just grab a pre-determined number of characters from the end of the string.

Explode the filename string into an array of strings, seperated by . and grab last element in array. This will either be the entire filename if no extension existed, or will be filename extension.

This function will return false if supplied $filename is empty.

function GetFileExtension($filename)
{
    if (!$filename_parts = explode(".", $filename))
    {
        return false; // $filename was empty.
    }
    else
    {
        return $filename_parts[count($filename_parts) - 1];
    }
}

echo GetFileExtension("bitmap.gif"); // Outputs 'gif'
echo GetFileExtension("anotherbitmap.jpeg"); // Outputs 'jpeg'
echo GetFileExtension("flashfile.swf"); // Outputs 'swf'
echo GetFileExtension("entirefilename"); // Outputs 'entirefilename'

Cheers,
Steven

[Weedpacket]

Or use [man]strrchr[/man].

Depending on what this is for, remember that just because a file ends with ".jpg", doesn't mean to say that it is a JPEG file....

[dotnotwhat]

Yes, strrchr seems a nicer way to do it...

function GetFileExtension($filename)
{
    if (!$extension = strrchr($filename, "."))
    {
        return false; // No . was found in filename or filename was empty.
    }
    else
    {
        return substr($extension, 1); // Strip leading . from extension.
    }
}

Note this will return false if file has no extension or if $filename is empty.