PHP image functions

How can we get the properties (size, type, width, height) of an image using PHP image functions?

Thanks in advance

getimagesize
Get the size of an image
$size = getimagesize($filename);

image_type_to_extension
Get file extension for image type
Returns a string with the extension corresponding to the given image type

image_type_to_mime_type
Get Mime-Type for image-type returned by getimagesize, exif_read_data, exif_thumbnail, exif_imagetype.

image2wbmp
Output image to browser or file.