getimagesize

getimagesize

(PHP 4, PHP 5, PHP 7)

getimagesize — Get the size of an image

Description

array getimagesize ( string $filename [, array &$imageinfo ] )

The getimagesize() function will determine the size of any supported given 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 and the correspondent HTTP content type.

getimagesize() can also return some more information in imageinfo 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.

Parameters

filename

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.

imageinfo

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.

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

<?php
$size = getimagesize($filename
$fp = fopen($filename, "rb"
if ($size && $fp) {
    header("Content-type: {$size['mime']}"
    fpassthru($fp
    exit;
} else {
    // error
}
?>

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.

Errors/Exceptions

If accessing the filename image is impossible getimagesize() will generate an error of level E_WARNING. On read error, getimagesize() will generate an error of level E_NOTICE.

Changelog

Examples

Example #2 getimagesize() example

<?php
list($width, $height, $type, $attr) = getimagesize("img/flag.jpg"
echo "<img src=\"img/flag.jpg\" $attr alt=\"getimagesize() example\" />";
?>

Example #3 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"

?>

Example #4 getimagesize() returning IPTC

<?php
$size = getimagesize("testimg.jpg", $info
if (isset($info["APP13"])) {
    $iptc = iptcparse($info["APP13"]
    var_dump($iptc
}
?>

Notes

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

See Also

• image_type_to_mime_type() - Get Mime-Type for image-type returned by getimagesize, exif_read_data, exif_thumbnail, exif_imagetype

• exif_imagetype() - Determine the type of an image

• exif_read_data() - Reads the EXIF headers from an image file

• exif_thumbnail() - Retrieve the embedded thumbnail of an image

← gd_info

getimagesizefromstring →

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