exif_imagetype

Manuale PHP
Indietro		Avanti

Descrizione

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.

Elenco dei parametri

filename: The image being checked.

Valori restituiti

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.

Log delle modifiche

Versione	Descrizione
4.3.2	Support for JPC, JP2, JPX, JB2, XBM, and WBMP
4.3.0	Support for SWC

Costanti predefinite

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

Tabella 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`

Esempi

Esempio 1. exif_imagetype() example
<?php if (exif_imagetype('image.gif') != IMAGETYPE_GIF) { echo 'The picture is not a gif'; } ?>

Indietro	Partenza	Avanti
Exif Functions	Risali	exif_read_data