get image size in php

How can we get the properties (size, type, width, height) of an image using PHP
image functions?
- getimagesize -- Get the size of an image
- Returns an array with 4 elements.
- Index 0 contains the width of the image in pixels.
- Index 1 contains the height.
- Index 2 is a flag indicating the type of the image: 1 = GIF, 2 = JPG, 3 = PNG, 4 = SWF, 5 = PSD, 6 = BMP, 7 = TIFF(intel byte order), 8 = TIFF(motorola byte order), 9 = JPC, 10 = JP2, 11 = JPX, 12 = JB2, 13 = SWC, 14 = IFF, 15 = WBMP, 16 = XBM. These values correspond to the IMAGETYPE constants that were added in PHP 4.3.
- Index 3 is a text string with the correct height="yyy" width="xxx" string that can be used directly in an IMG tag.
- Example:

list($width, $height, $type, $attr) = getimagesize("reset.jpg");
echo "

Width : ".$width;
echo "
Height : ".$height;
echo "
Type : ".$type;
echo "
Attribute : ".$attr;

/* Output :

Width : 53
Height : 22
Type : 2
Attribute : width="53" height="22"

*/
?>