getimagesize

Get the size of an image.

getimagesize Function synopsis

getimagesize(string $filename, &$image_info = null): array|false

Parameters

$filename

Typestring

This 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_info

Passed by reference, OptionalDefault valuenull

This 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 that the parameter $image_info is passed by reference, and contains additional/updated context data that may be useful.

Return value

Typearray|false

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.

Some formats may contain no image or may contain multiple images. In these
cases, [`getimagesize`](/codex/getimagesize) might not be able to properly
determine the image size. [`getimagesize`](/codex/getimagesize) will return
zero for width and height in these cases.

Index 2 is one of the IMAGETYPE_* 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:

channels will be 3 for RGB pictures and 4 for CMYK pictures.

bits is the number of bits for each color.

For some image types, the presence of channels and bits 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.

On failure, false is returned.