PHP: Getting the File Type of an Image

I am working on an image upload plugin that uses JQuery. I am using PHP on the backend. I have found that there are multiple ways to use PHP to get the file extension of an image.

PathInfo

PathInfo is probably the most common way get information about a file.

$path_parts = pathinfo('http://grasshopperpebbles.com/photogallery/thumbs/pic1.png');
echo $path_parts['dirname']; //output: http://grasshopperpebbles.com
echo $path_parts['basename']; //output: pic1.png
echo $path_parts['extension']; //output: png
echo $path_parts['filename']; //output: pic1

GetImageSize

Although I have used PHP’s getimagesize to get the dimensions of an image, it can also be used to get other information (to include the file type):

list($width, $height, $type) = getimagesize('pic1.png');
echo $type; //output: png

End

Recently, I stumbled upon a new way to get the file extension:

$file_name = current(explode('.', 'pic1.png'));
$ext = end(explode('.', 'pic1.png'));
echo $file_name; //output: pic1
echo $ext; //output: png

I’m sure there are other ways to use PHP to get the file type as well.

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