GetImageSize -- get the size of a GIF, JPG or PNG image


array getimagesize(string filename, array [imageinfo]);

The GetImageSize() function will determine the size of any GIF, JPG or PNG image file and return the dimensions along with the file type and a height/width text string to be used inside a normal HTML IMG tag.

Returns an array with 4 elements. Index 0 contains the width of the image in pixels. Index 1 contains the height. Index 2 a flag indicating the type of the image. 1 = GIF, 2 = JPG, 3 = PNG. Index 3 is a text string with the correct "height=xxx width=xxx" string that can be used directly in an IMG tag.

Example 1. GetImageSize

<?php $size = GetImageSize("img/flag.jpg"); ?>
<IMG SRC="img/flag.jpg" <?php echo $size[3]; ?>>

The optional imageinfo parameter allows you to extract some extended information from the image file. Currently this will return the diffrent JPG APP markers in an associative Array. Some Programs use these APP markers to embedd text information in images. A very common one in to embed IPTC information in the APP13 marker. You can use the iptcparse() function to parse the binary APP13 marker into something readable.

Example 2. GetImageSize returning IPTC

    $size = GetImageSize("testimg.jpg",&$info);
    if (isset($info["APP13"])) {
        $iptc = iptcparse($info["APP13"]);

Note: This function does not require the GD image library.