Compzone.Org :: Podręcznik PHP :: exif_imagetype

Podręcznik PHP
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exif_imagetype

(PHP 4 >= 4.3.0, PHP 5)

exif_imagetype -- Determine the type of an image

Opis

int exif_imagetype ( string filename )

exif_imagetype() reads the first bytes of an image and checks its signature.

exif_imagetype() can be used to avoid calls to other exif functions with unsupported file types or in conjunction with $_SERVER['HTTP_ACCEPT'] to check whether or not the viewer is able to see a specific image in the browser.

Parametry

filename: The image being checked.

Zwracane wartości

When a correct signature is found, the appropriate constant value will be returned otherwise the return value is FALSE. The return value is the same value that getimagesize() returns in index 2 but exif_imagetype() is much faster.

Rejestr zmian

Wersja	Opis
4.3.2	Support for JPC, JP2, JPX, JB2, XBM, and WBMP
4.3.0	Support for SWC

Stałe predefinopwane

The following constants are defined, and represent possible exif_imagetype() return values:

Tabela 1. Imagetype Constants

Value	Constant
1	`IMAGETYPE_GIF`
2	`IMAGETYPE_JPEG`
3	`IMAGETYPE_PNG`
4	`IMAGETYPE_SWF`
5	`IMAGETYPE_PSD`
6	`IMAGETYPE_BMP`
7	`IMAGETYPE_TIFF_II` (intel byte order)
8	`IMAGETYPE_TIFF_MM` (motorola byte order)
9	`IMAGETYPE_JPC`
10	`IMAGETYPE_JP2`
11	`IMAGETYPE_JPX`
12	`IMAGETYPE_JB2`
13	`IMAGETYPE_SWC`
14	`IMAGETYPE_IFF`
15	`IMAGETYPE_WBMP`
16	`IMAGETYPE_XBM`

Przykłady

Przykład 1. exif_imagetype() example

<?php
if (exif_imagetype('image.gif') != IMAGETYPE_GIF) {

                    echo 'The picture is not a gif';


                }
?>

Patrz także

getimagesize()

Poprzedni	Spis treści	Następny
Exif Functions	Początek rozdziału	exif_read_data