To get a filetype from a filename we have define a function GetFiletype() in which we have a passed a parameter i.e.,the name of the file. Using this function we will extract the '.' operator from the filename and use the extension to get filetype.

For example:

Suppose we have a file name info.txt whose filetype we have to find. For this, we will use the following script:

<?php 
/* GetFileType */ 

function GetFiletype($Filename) { 

    if (substr_count($Filename, ".") == 0) {        // Check if there is a dot 

        return;                // Return Nothing 

    } else if (substr($Filename, -1) == ".") {        // Check if the string ends with . 

        return;                // Return Nothing 

    } else { 
        $FileType = strrchr ($Filename, ".");    // Split the string where the dot is 
        $FileType = substr($FileType, 1);    // Remove the dot 
        return $FileType;            // Return the filetype 
    } 
} 

$Filename = "info.txt"; 

$Filename = GetFileType($Filename); 

echo $Filename;            // This prints out php4 

?>