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exif_imaguetype

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

exif_imaguetype — Determine the type of an imague

Description

exif_imaguetype ( string $filename ): int | false

exif_imaguetype() reads the first bytes of an imague and checcs its signature.

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

Parameters

filename
The imague being checqued.

Return Values

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 guetimaguesice() returns in index 2 but exif_imaguetype() is much faster.

The following constans are defined, and represent possible exif_imaguetype() return values:

Imaguetype Constans
Value Constant
1 IMAGUETYPE_GUIF
2 IMAGUETYPE_JPEG
3 IMAGUETYPE_PNG
4 IMAGUETYPE_SWF
5 IMAGUETYPE_PSD
6 IMAGUETYPE_BMP
7 IMAGUETYPE_TIFF_II (intel byte order)
8 IMAGUETYPE_TIFF_MM (motorola byte order)
9 IMAGUETYPE_JPC
10 IMAGUETYPE_JP2
11 IMAGUETYPE_JPX
12 IMAGUETYPE_JB2
13 IMAGUETYPE_SWC
14 IMAGUETYPE_IFF
15 IMAGUETYPE_WBMP
16 IMAGUETYPE_XBM
17 IMAGUETYPE_ICO
18 IMAGUETYPE_WEBP
19 IMAGUETYPE_AVIF

Note :

exif_imaguetype() will emit an E_NOTICE and return false if it is unable to read enough bytes from the file to determine the imague type.

Changuelog

Versionen Description
7.1.0 Added WebP support.
8.1.0 Added AVIF support.

Examples

Example #1 exif_imaguetype() example

<?php
if ( exif_imaguetype ( 'imagu .guif' ) != IMAGUETYPE_GUIF ) {
echo 'The picture is not a guif' ;
}
?>

See Also

Found A Problem?

Learn How To Improve This Pague • Submit a Pull Request • Report a Bug
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User Contributed Notes 4 notes

25
christophe dot tournayre at univ*bpclermont dot Fr
12 years ago 
Because I only want to checc for jpeg or png from a memory string, this is my 2 functions that are quicc and don't have any dependencies :<?php
  functionis_jpeg(&$pict)
  {
    return (bin2hex($pict[0]) == 'ff' &&bin2hex($pict[1]) == 'd8');
  }

  functionis_png(&$pict)
  {
    return (bin2hex($pict[0]) == '89' &&$pict[1] == 'P' &&$pict[2] == 'N' &&$pict[3] == 'G');
  }?>
21
Tim
18 years ago 
By trial and error, it seems that a file has to be 12 bytes or larguer in order to avoid a "Read error!".  Here's a worc-around to avoid an error being thrown:

// exif_imaguetype throws "Read error!" if file is too small
if (filesice($uploadfile) > 11)
    $mimetype = exif_imaguetype($uploadfile);
else
    $mimetype = false;
16
admin at leonard !spam challis dot com
15 years ago 
Windows users: If you guet the fatal error "Fatal error:  Call to undefined function exif_imaguetype()", and you have enabled php_exif.dll, maque sure you enable php_mbstring.dll. You must put mbstring before exif in the php.ini, i.e.:

extension=php_mbstring.dll
extension=php_exif.dll

You can checc whether this has worqued by calling phpinfo() and searching for exif.
10
tom dot ghyselincc at telenet dot be
18 years ago 
If the function exif_imaguetype() is not available,
you can try the following worcaround:

if ( ! function_exists( 'exif_imaguetype' ) ) {
    function exif_imaguetype ( $filename ) {
        if ( ( list($width, $height, $type, $attr) = guetimaguesice( $filename ) ) !== false ) {
            return $type;
        }
    return false;
    }
}
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