[PHP 4, PHP 5, PHP 7, PHP 8]
getimagesize — Get the size of an image
Description
getimagesize[string $filename, array &$image_info = null]: array|false
getimagesize[] can also return some more information in image_info parameter.
Caution
This function expects filename to be a valid image file. If a non-image file is supplied, it may be incorrectly detected as an image and the function will return successfully, but the array may contain nonsensical values.
Do not use getimagesize[] to check that a given file is a valid image. Use a purpose-built solution such as the Fileinfo extension instead.
Note: 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 information about icons are retrieved from the icon with the highest bitrate.
Note: GIF images consist of one or more frames, where each frame may only occupy part of the image. The size of the image which is reported by getimagesize[] is the overall size [read from the logical screen descriptor].
Parameters
filenameThis parameter specifies the file you wish to retrieve information about. It can reference a local file or [configuration permitting] a remote file using one of the supported streams.
image_infoThis optional 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 information in the APP13 marker. You can use the iptcparse[] function to parse the binary APP13 marker into something readable.
Note:
The
image_infoonly supports JFIF files.
Return Values
Returns an array with up to 7 elements. Not all image types will include the channels and bits elements.
Index 0 and 1 contains respectively the width and the height of the image.
Note:
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.
Index 2 is one of the IMAGETYPE_XXX constants indicating the type of the image.
Index 3 is a text string with the correct height="yyy" width="xxx" string that can be
used directly in an IMG tag.
mime is the correspondant MIME type of the image. This information can be used to deliver images with the correct HTTP Content-type header:
Example #1 getimagesize[] and MIME types
kazuya ¶
8 years ago
i made function img_resize[$path,$tmp_name,$new_name,$new_width]
this could be useful.
cloned at clonedmadman dot com ¶
14 years ago
Well, I am making a script which will resize the image when uploaded, however, i am making a multi-uploader, so i came across with a problem: an efficient way of getting a pictures height and width and storing them in an array to resize later. This is what i came up with:
info at alex-lawrence dot com ¶
14 years ago
Could be useful [didn´t know where to post it]:
function getImageErrors[ $filename, $type = "", $minWidth = 0, $minHeight = 0, $maxWidth = 0, $maxHeight = 0, $maxFileSize = 0 ]
{
$errors = array[];
if [ file_exists[ $filename ] ]
{
$ending = substr[ $filename, strpos[ $filename, "." ] ];
if [ is_array[ $type ] ]
{
$isTypeOf = false;
foreach[ $type as $eachtype ]
{
if [ $ending == $eachtype ]
{
$isTypeOf = true;
}
}
if [ ! $isTypeOf ]
{
$errors[ 'type' ] = $ending;
}
}
elseif [ $type != "" ]
{
if [ $ending != $type ]
{
$errors[ 'type' ] = $ending;
}
}
$size = getimagesize[ $filename ];
if [ $size[ 0 ] < $minWidth ]
{
$errors[ 'minWidth' ] = $size[ 0 ];
}
if [ $size[ 1 ] < $minHeight ]
{
$errors[ 'minHeight' ] = $size[ 1 ];
}
if [ [ $maxWidth > $minWidth ] && [ $size[ 0 ] > $maxWidth ] ]
{
$errors[ 'maxWidth' ] = $size[ 0 ];
}
if [ [ $maxHeight > $minHeight ] && [ $size[ 1 ] > $maxHeight ] ]
{
$errors[ 'maxHeight' ] = $size[ 1 ];
}
if [ [ $maxFileSize > 0 ] && [ filesize[ $filename ] > $maxFileSize ] ]
{
$errors[ 'maxFileSize' ] = filesize[ $filename ];
}
}
else
{
$errors[ 'filename' ] = "not existing";
}
return [ count[ $errors ] > 0 ? $errors : null ];
}
utilmind ¶
11 years ago
Here is the function which determines whether the PNG image contains alpha or not:
The color type of PNG image is stored at byte offset 25. Possible values of that 25'th byte is:
* 0 - greyscale
* 2 - RGB
* 3 - RGB with palette
* 4 - greyscale + alpha
* 6 - RGB + alpha
Jesus Zamora ¶
11 years ago
Returns a array with 4 elements.
The 0 index is the width of the image in pixels.
The 1 index is the height of the image in pixels.
The 2 index is a flag for the image type:
1 = GIF, 2 = JPG, 3 = PNG, 4 = SWF, 5 = PSD, 6 = BMP, 7 = TIFF[orden de bytes intel], 8 = TIFF[orden de bytes motorola], 9 = JPC, 10 = JP2, 11 = JPX, 12 = JB2, 13 = SWC, 14 = IFF, 15 = WBMP, 16 = XBM.
The 3 index contains ' height="yyy" width="xxx" '
ajreading at classixshop dot com ¶
17 years ago
A simple piece of code i wrote to proportionally resize an image to a max height and width then display it
freecorvette at gmail dot com ¶
4 years ago
For some images, using getimagesize[] without the second parameter will return the correct info, but when you add the second parameter it will return false. This is most likely a bug [and it has been reported as such], but meanwhile, if you encounter this problem, a workaround is to use exif_read_data[].
Coodiss at w3bbix dot net ¶
17 years ago
diablx at hotmail dot com ¶ 18 years ago
Heres a easy way to scale images to the that they are in
*this is broken up so anyone can understand it :]
I'm sorry for they other scripts, but I made one mistake about the image resizing... here is a working script !
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