PHP how can i check if a file is mp3 or image file

Question

how can i check if a file is an mp3 file or image file, other than check each possible extension?

Answer 1

To find the mime type of a file I use the following wrapper function:

function Mime($path)
{
    $result = false;

    if (is_file($path) === true)
    {
        if (function_exists('finfo_open') === true)
        {
            $finfo = finfo_open(FILEINFO_MIME_TYPE);

            if (is_resource($finfo) === true)
            {
                $result = finfo_file($finfo, $path);
            }

            finfo_close($finfo);
        }

        else if (function_exists('mime_content_type') === true)
        {
            $result = preg_replace('~^(.+);.*$~', '$1', mime_content_type($path));
        }

        else if (function_exists('exif_imagetype') === true)
        {
            $result = image_type_to_mime_type(exif_imagetype($path));
        }
    }

    return $result;
}

Answer 2

For Images, I use:

    function is_image($path)
   {
    $a = getimagesize($path);
    $image_type = $a[2];

    if(in_array($image_type , array(IMAGETYPE_GIF , IMAGETYPE_JPEG ,IMAGETYPE_PNG , IMAGETYPE_BMP)))
    {
        return true;
    }
    return false;
    }

Answer 3

You can use FileInfo module which is built into PHP since 5.3. If you are using a PHP version less than PHP 5.3, you can install it as a PECL extension:

After installation the finfo_file function will return file information.

PECL extension: http://pecl.php.net/package/fileinfo

PHP Documentation: http://www.php.net/manual/en/book.fileinfo.php

Answer 4

try mime_content_type()

<?php
echo mime_content_type('php.gif') . "\n";
echo mime_content_type('test.php');
?> 

Output:

image/gif

text/plain

Or better use finfo_file() the other way is deprecated.

Answer 5

Native ways to get the mimetype:

For PHP < 5.3 use mime_content_type()
For PHP >= 5.3 use finfo_fopen()

Alternatives to get the MimeType are exif_imagetype and getimagesize, but these rely on having the appropriate libs installed. In addition, they will likely just return image mimetypes, instead of the whole list given in magic.mime.

If you don't want to bother about what is available on your system, just wrap all four functions into a proxy method that delegates the function call to whatever is available, e.g.

function getMimeType($filename)
{
    $mimetype = false;
    if(function_exists('finfo_fopen')) {
        // open with FileInfo
    } elseif(function_exists('getimagesize')) {
        // open with GD
    } elseif(function_exists('exif_imagetype')) {
       // open with EXIF
    } elseif(function_exists('mime_content_type')) {
       $mimetype = mime_content_type($filename);
    }
    return $mimetype;
}