Description
array
getimagesize ( string filename [, array imageinfo])
The GetImageSize() function will determine the
size of any GIF, JPG,
PNG, SWF,
PSD, TIFF
or BMP 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, 4 = SWF, 5 = PSD, 6 = BMP, 7 = TIFF(intel byte order),
8 = TIFF(motorola byte order, 9 = JPC, 10 = JP2, 11 = JPX.
Index 3 is a text string with the correct
height="yyy" width="xxx" string that can be used directly in an IMG
tag.
Example 1. GetImageSize (file) <?php $size = GetImageSize ("img/flag.jpg"); ?>
<IMG SRC="img/flag.jpg" <?php echo $size[3]; ?> |
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Example 2. GetImageSize (URL) <?php $size = GetImageSize ("http://www.php.net/gifs/logo.gif"); ?> |
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With JPG images, two extras index are returned :
channel and bits.
channel will be 3 for RGB pictures, and 4 for CMYK
pictures. bits is the number of bits for each color.
If accessing the filename image is impossible,
or if it isn't a valid picture, getimagesize()
will return NULL and generate a warning.
The optional imageinfo parameter allows
you to extract some extended information from the image
file. Currently this will return the different
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
http://www.iptc.org/ information in the
APP13 marker. You can use the iptcparse()
function to parse the binary APP13 marker into something
readable.
Example 3. GetImageSize returning IPTC <?php
$size = GetImageSize ("testimg.jpg",&$info);
if (isset ($info["APP13"])) {
$iptc = iptcparse ($info["APP13"]);
var_dump ($iptc);
}
?> |
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