Description
array
getimagesize ( string filename [, array &imageinfo] )
The getimagesize() function will determine the
size of any GIF, JPG,
PNG, SWF,
SWC, PSD,
TIFF, BMP,
IFF, JP2,
JPX, JB2,
JPC, XBM, or
WBMP 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.
If accessing the filename image is impossible,
or if it isn't a valid picture, getimagesize()
will return FALSE and generate an error of level
E_WARNING.
Note:
Support for JPC, JP2,
JPX, JB2,
XBM, and WBMP became available in
PHP 4.3.2. Support for SWC exists as of PHP 4.3.0
and TIFF support was added in PHP 4.2.0
Note:
JPEG 2000 support was added in PHP 4.3.2. Note that JPC and JP2 are
capable of having components with different bit depths. In this case,
the value for "bits" is the highest bit depth encountered. Also, JP2
files may contain multiple JPEG 2000 codestreams. In this case,
getimagesize() returns the values for the first
codestream it encounters in the root of the file.
Note:
The getimagesize() function does not require the GD
image library.
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 4.3.0. 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
list($width, $height, $type, $attr) = getimagesize("img/flag.jpg");
echo "<img src=\"img/flag.jpg\" $attr alt=\"getimagesize() example\" />";
?>
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URL support was added in PHP 4.0.5
Example 2. getimagesize (URL)
<?php
$size = getimagesize("http://www.example.com/gifs/logo.gif");
// if the file name has space in it, encode it properly
$size = getimagesize("http://www.example.com/gifs/lo%20go.gif");
?>
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With JPG images, two extra indexes are returned:
channels and bits.
channels will be 3 for RGB pictures and 4 for CMYK
pictures. bits is the number of bits for each color.
Beginning with PHP 4.3.0, bits and
channels are present for other image types, too.
However, the presence of these values can be a bit confusing. As an
example, GIF always uses 3 channels per pixel, but the
number of bits per pixel cannot be calculated for an animated
GIF with a global color table.
Some formats may contain no image or may contain multiple images. In these
cases, getimagesize() might not be able to properly
determine the image size. getimagesize() will return
zero for width and height in these cases.
Beginning with PHP 4.3.0, getimagesize() also returns an
additional parameter, mime, that corresponds with the
MIME type of the image. This information can be used to deliver images
with correct HTTP Content-type headers:
Example 3. getimagesize() and MIME types
<?php
$size = getimagesize($filename);
$fp=fopen($filename, "rb");
if ($size && $fp) {
header("Content-type: {$size['mime']}");
fpassthru($fp);
exit;
} else {
// error
}
?>
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The optional imageinfo parameter allows
you to extract some extended information from the image
file. Currently, this will return the different
JPG APP markers as an associative array. Some
programs use these APP markers to embed text information in
images. A very common one is 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 4. getimagesize() returning IPTC
<?php
$size = getimagesize("testimg.jpg", $info);
if (isset($info["APP13"])) {
$iptc = iptcparse($info["APP13"]);
var_dump($iptc);
}
?>
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See also image_type_to_mime_type(),
exif_imagetype(),
exif_read_data(), and
exif_thumbnail().
