Validate file extension

Created by Sebastien Hordeaux, last update on 26/02/2008 17:31

This simple function help you to validate that a file has an allowed extension.

function validate_extension($filename, $validExtensions = array('zip',
'rar', 'jpg', 'jpeg', 'gif', 'bmp'))
{
    // find the last dot inside the filename
    $dotPos = strrpos($filename, '.');
    // if no dot was found, the extension is not valid
    if (false === $dotPos) {
        return false;
    } 
    // get the extension, be sure the dot is not included, and be sure
the
    // string gets to lowercase
    $extension = substr($filename, ($dotPos + 1));
 
    $extension = strtolower($extension); 
    // when the extension is inside the array, it is valid
    return in_array($extension, $validExtensions);
} 

Dependencies

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