PHP Unconference Europe 2015

image_type_to_extension

(PHP 5)

image_type_to_extensionRetourne l'extension du fichier pour le type d'image

Description

string image_type_to_extension ( int $imagetype [, bool $include_dot = TRUE ] )

image_type_to_extension() retourne l'extension pour la constante IMAGETYPE_XXX fournie.

Liste de paramètres

imagetype

Une des constantes IMAGETYPE_XXX.

include_dot

Si l'on doit ajouter un point à l'extension ou non. Par défaut, vaut TRUE.

Valeurs de retour

Une chaîne de caractères avec l'extension, correspondant au type de l'image fournie.

Exemples

Exemple #1 Exemple avec image_type_to_extension()

<?php
// Création d'une instance d'image
$im imagecreatetruecolor(100100);

// Sauvegarde de l'image
imagepng($im'./test' image_type_to_extension(IMAGETYPE_PNG));
imagedestroy($im);
?>

Notes

Note:

Cette fonction ne nécessite pas la bibliothèque GD.

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User Contributed Notes 10 notes

up
4
Ian Paul Short chukdocsAtHotmailDotCom
8 years ago
To: mail at spybreak dot de

I noted  your solution was for mime_type_to_extension which is flawed because the MIME types to extensions are not unique. See my example to consider what I have observed.

This function performs image type or mime type to extension. With limitation it will not attempt to handle duplicated MIME types. NOT DEFINITIVE!
<?php
   
if(!function_exists('image_type_to_extension')){      

       
$extension;

        function
image_type_or_mime_type_to_extension($image_type, $include_dot) {
           
define ("INVALID_IMAGETYPE", '');
           
           
$extension = INVALID_IMAGETYPE;            /// Default return value for invalid input

           
$image_type_identifiers = array (                                                                ### These values correspond to the IMAGETYPE constants
                   
array (IMAGETYPE_GIF         => 'gif',     "mime_type" => 'image/gif'),                        ###  1 = GIF
                   
array (IMAGETYPE_JPEG        => 'jpg',     "mime_type" => 'image/jpeg'),                        ###  2 = JPG
                   
array (IMAGETYPE_PNG        => 'png',     "mime_type" => 'image/png'),                        ###  3 = PNG
                   
array (IMAGETYPE_SWF        => 'swf',     "mime_type" => 'application/x-shockwave-flash'),    ###  4 = SWF  // A. Duplicated MIME type
                   
array (IMAGETYPE_PSD        => 'psd',     "mime_type" => 'image/psd'),                        ###  5 = PSD
                   
array (IMAGETYPE_BMP        => 'bmp',     "mime_type" => 'image/bmp'),                        ###  6 = BMP
                   
array (IMAGETYPE_TIFF_II    => 'tiff',     "mime_type" => 'image/tiff'),                        ###  7 = TIFF (intel byte order)
                   
array (IMAGETYPE_TIFF_MM    => 'tiff',     "mime_type" => 'image/tiff'),                        ###  8 = TIFF (motorola byte order)
                   
array (IMAGETYPE_JPC        => 'jpc',     "mime_type" => 'application/octet-stream'),            ###  9 = JPC  // B. Duplicated MIME type
                   
array (IMAGETYPE_JP2        => 'jp2',     "mime_type" => 'image/jp2'),                        ### 10 = JP2
                   
array (IMAGETYPE_JPX        => 'jpf',     "mime_type" => 'application/octet-stream'),            ### 11 = JPX  // B. Duplicated MIME type
                   
array (IMAGETYPE_JB2        => 'jb2',     "mime_type" => 'application/octet-stream'),            ### 12 = JB2  // B. Duplicated MIME type           
                   
array (IMAGETYPE_SWC        => 'swc',     "mime_type" => 'application/x-shockwave-flash'),    ### 13 = SWC  // A. Duplicated MIME type
                   
array (IMAGETYPE_IFF        => 'aiff',     "mime_type" => 'image/iff'),                        ### 14 = IFF
                   
array (IMAGETYPE_WBMP        => 'wbmp',     "mime_type" => 'image/vnd.wap.wbmp'),                ### 15 = WBMP
                   
array (IMAGETYPE_XBM        => 'xbm',     "mime_type" => 'image/xbm')                            ### 16 = XBM
           
);                                                                                   
           
            if((
is_int($image_type)) AND (IMAGETYPE_GIF <= $image_type) AND (IMAGETYPE_XBM >= $image_type)){
               
$extension = $image_type_identifiers[$image_type-1]; // -1 because $image_type_identifiers array starts at [0]
               
$extension = $extension[$image_type];
            }
            elseif(
is_string($image_type) AND (($image_type != 'application/x-shockwave-flash') OR ($image_type != 'application/octet-stream'))){               
           
               
$extension match_mime_type_to_extension($image_type, $image_type_identifiers);
            }
            else
            {
               
$extension = INVALID_IMAGETYPE;
            }

               if(
is_bool($include_dot)){

                   if((
false != $include_dot) AND (INVALID_IMAGETYPE != $extension)){
                      
$extension = '.' . $extension;
                   }
               }
               else
               {
                  
$extension = INVALID_IMAGETYPE;
               }                 
      
           return
$extension;

           }
    }   

    function
match_mime_type_to_extension($image_type, $image_type_identifiers){
       
// Return from loop on a match
       
foreach($image_type_identifiers as $_key_outer_loop => $_val_outer_loop){           
            foreach(
$_val_outer_loop as $_key => $_val){
                if(
is_int ($_key)){             // Keep record of extension for mime check
                   
$extension = $_val;
                }
                if(
$_key == 'mime_type'){   
                    if(
$_val === $image_type){    // Found match no need to continue looping
                       
return $extension;        ### Return
                   
}                    
                }
            }
        }
       
// Compared all values without match
       
return $extension = INVALID_IMAGETYPE;   
    }
   
   
$extension = image_type_or_mime_type_to_extension($image_type, $include_dot);
     return
$extension;
}
?>
up
1
bimal at sanjaal dot com
2 years ago
<?php
/**
* Returns a COMMON extension with a dot
*/
function gd_extension($full_path_to_image='')
{
   
$extension = 'null';
    if(
$image_type = exif_imagetype($full_path_to_image))
    {
       
$extension = image_type_to_extension($image_type, false);
    }
   
$known_replacements = array(
       
'jpeg' => 'jpg',
       
'tiff' => 'tif',
    );
   
$extension = '.'.str_replace(array_keys($known_replacements), array_values($known_replacements), $extension);
   
    return
$extension;
}

# Testing
$images = glob('*');
foreach(
$images as $i => $image)
{
   
$extension = gd_extension($image);
    echo
"\r\n", $image, ': ', $extension;
}
?>

Sometimes, the extension is not as I expected, until I wrote this piece.
up
0
mew at world dot org
6 years ago
There is no need to over complicated folks.

<?php

if ( !function_exists('image_type_to_extension') ) {

    function
image_type_to_extension ($type, $dot = true)
    {
       
$e = array ( 1 => 'gif', 'jpeg', 'png', 'swf', 'psd', 'bmp'
            'tiff'
, 'tiff', 'jpc', 'jp2', 'jpf', 'jb2', 'swc',
           
'aiff', 'wbmp', 'xbm');

       
// We are expecting an integer.
       
$type = (int)$type;
        if (!
$type) {
           
trigger_error( '...come up with an error here...', E_USER_NOTICE );
            return
null;
        }

        if ( !isset(
$e[$type]) ) {
           
trigger_error( '...come up with an error here...' E_USER_NOTICE );
            return
null;
        }

        return (
$dot ? '.' : '') . $e[$type];
    }
   
}

if ( !
function_exists('image_type_to_mime_type') ) {

    function
image_type_to_mime_type ($type)
    {
       
$m = array ( 1 => 'image/gif', 'image/jpeg', 'image/png',
           
'application/x-shockwave-flash', 'image/psd', 'image/bmp',
           
'image/tiff', 'image/tiff', 'application/octet-stream',
           
'image/jp2', 'application/octet-stream', 'application/octet-stream',
           
'application/x-shockwave-flash', 'image/iff', 'image/vnd.wap.wbmp', 'image/xbm');

       
// We are expecting an integer.
       
$type = (int)$type;
        if (!
$type) {
           
trigger_error( '...come up with an error here...', E_USER_NOTICE );
            return
null;
        }

        if ( !isset(
$m[$type]) ) {
           
trigger_error( '...come up with an error here...' E_USER_NOTICE );
            return
null;
        }

        return
$m[$type];
    }

}

?>
up
0
Chris
7 years ago
- Function was added in PHP 5.2, not PHP 5 (you would assume this means 5.0)
- Function returns .jpeg, not .jpg
up
0
Ian Paul Short chukdocsAtHotmailDotCom
8 years ago
2006-09-29

A few notes about some contributions on this page.

1. It seemed to me that on the face it of all of the offerings to emulate "image_type_to_extension" function fell short of the mark in one way or another (See my comments below). That's why I wrote my own and submitted to this page below. In respect of my work any comments, bugs noted or improvements would be gratefully received.

2. Avoid using the Switch statement in an unconventional method to "Break" (I note the use of the return statement!). Also even if it does nothing at the inception of our code - Still put in the default case (It lets others realise that a default is not required or at worst forgotton.

3. In an environment that is under your control the risk of an error by determining the content by its extension or MIME type may seem an attractive solution to a problem. However, in the real world there's no guarantee that a MIME type or file extension is correct for it's associated file.

Consider using functions to get the image type:
      getimagesize or (This is available without GD)
      exif_imagetype

4. There's more to coding than just putting something together to do a job!!! But whatever is done is worthwhile - Hence expletives have no place in this forum!!

5. The idea from "oridan at hotmail dot com" is a very slick idea. I will be taking a closer look at this for my own project.
up
0
Ian Paul Short
8 years ago
2006-09-29 Author: Ian Paul Short (chukdocs at hotmail dot com)

For reasons I have yet to determine the function “image_type_to_extension” is not available to both PHP 5.1.4 on my local host running under Windows XP or on my remote host running under Linux. Has anyone else had this problem? If so kindly post your findings here please.

In the meantime I needed a workaround and with many thanks to the previous contributors on this page - I took bits and pieces developed the following function to emulate the function image_type_to_extension:

    if(!function_exists('image_type_to_extension')){    ### Include this for graceful tranisition to using
                                                        ### PHP's equivalent function when it's available in the box
       
        function image_type_to_extension($image_type, $include_dot){
           
            // Assign definitions and intialise variables
            define ("INVALID_IMAGETYPE", '');            // Empty string            
            $extension = INVALID_IMAGETYPE;             // Return this (empty string) if "$image_type or $include_dot" do not contain legal values  

           
            if((is_int($image_type)) AND (is_bool($include_dot)) AND (IMAGETYPE_GIF <= $image_type) AND (IMAGETYPE_XBM >= $image_type)){ // Check input data are legal
           
                $image_type_extension = array (            ### These integer values correspond to the the respective IMAGETYPE constants
                    IMAGETYPE_GIF         => 'gif',        ###  1 = GIF
                    IMAGETYPE_JPEG         => 'jpg',        ###  2 = JPG
                    IMAGETYPE_PNG         => 'png',        ###  3 = PNG
                    IMAGETYPE_SWF         => 'swf',        ###  4 = SWF
                    IMAGETYPE_PSD         => 'psd',        ###  5 = PSD
                    IMAGETYPE_BMP         => 'bmp',        ###  6 = BMP   
                    IMAGETYPE_TIFF_II     => 'tiff',        ###  7 = TIFF     (intel byte order)
                    IMAGETYPE_TIFF_MM     => 'tiff',        ###  8 = TIFF     (motorola byte order)
                    IMAGETYPE_JPC         => 'jpc',        ###  9 = JPC
                    IMAGETYPE_JP2         => 'jp2',        ### 10 = JP2
                    IMAGETYPE_JPX         => 'jpf',        ### 11 = JPX     Yes! jpf extension is correct for JPX image type
                    IMAGETYPE_JB2         => 'jb2',        ### 12 = JB2
                    IMAGETYPE_SWC         => 'swc',        ### 13 = SWC
                    IMAGETYPE_IFF         => 'aiff',        ### 14 = IFF
                    IMAGETYPE_WBMP         => 'wbmp',        ### 15 = WBMP
                    IMAGETYPE_XBM         => 'xbm'        ### 16 = XBM
                );
                           
                $extension = $image_type_extension[$image_type]; // Get extension by using array as a look up table using $image_type as key
               
                if($include_dot != false) $extension = '.' . $extension; // If $include_dot is true prefix a dot to extension
               }

### Limitation - No user friendly error handler              
/*           
            else
               {
                   ### Put your error handler here
               }                   
*/       
        return $extension;
        }
    }
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0
aleksandrs dot bogdanovs at gmail dot com
8 years ago
When I was writing a script for my photo website, it was necessary to write such function, which can get the extension of uploaded file (image), so the function is:

<?php
function get_extension($imagetype)
   {
       if(empty(
$imagetype)) return false;
       switch(
$imagetype)
       {
           case
'image/bmp': return '.bmp';
           case
'image/cis-cod': return '.cod';
           case
'image/gif': return '.gif';
           case
'image/ief': return '.ief';
           case
'image/jpeg': return '.jpg';
           case
'image/pipeg': return '.jfif';
           case
'image/tiff': return '.tif';
           case
'image/x-cmu-raster': return '.ras';
           case
'image/x-cmx': return '.cmx';
           case
'image/x-icon': return '.ico';
           case
'image/x-portable-anymap': return '.pnm';
           case
'image/x-portable-bitmap': return '.pbm';
           case
'image/x-portable-graymap': return '.pgm';
           case
'image/x-portable-pixmap': return '.ppm';
           case
'image/x-rgb': return '.rgb';
           case
'image/x-xbitmap': return '.xbm';
           case
'image/x-xpixmap': return '.xpm';
           case
'image/x-xwindowdump': return '.xwd';
           case
'image/png': return '.png';
           case
'image/x-jps': return '.jps';
           case
'image/x-freehand': return '.fh';
           default: return
false;
       }
   }
?>

It's useful for those, who upload files on server.
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0
oridan at hotmail dot com
8 years ago
i used your code in the following to open different types of files depending on their 'type' (or rather, extension).  the eval simply creates
<?
// make sure you initialize $filename as the path to the image you want to load/create

  
list(,,$type) = getimagesize($filename);
  
$type = image_type_to_extension($type);
   eval(
"global \$filename; \$source = imagecreatefrom$type(\$filename);");
   global
$source;
?>

$source is then the var you can play with.  saved me a big switch statement calling different "imagecreatefromjpg"/"imagecreatefromgif" functions just to do the one simple task.... open an image of varying types.
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0
robe at amd dot co dot at
9 years ago
neil: your version fails to make sense for me
spybreak.de guy:

a) you left out BMP
b) you fucked up the order of the extension in the mid of the listing. if this was changed in the getimagesize function during php versions, I'm sorry. Otherwise: WHY?!
c) the include_dot stuff is the worst abuse of function arguments I've ever seen. Shame on you.

Here's a unfucked, working version:

<?
if(!function_exists('image_type_to_extension'))
{
   function
image_type_to_extension($imagetype)
   {
       if(empty(
$imagetype)) return false;
       switch(
$imagetype)
       {
           case
IMAGETYPE_GIF    : return 'gif';
           case
IMAGETYPE_JPEG    : return 'jpg';
           case
IMAGETYPE_PNG    : return 'png';
           case
IMAGETYPE_SWF    : return 'swf';
           case
IMAGETYPE_PSD    : return 'psd';
           case
IMAGETYPE_BMP    : return 'bmp';
           case
IMAGETYPE_TIFF_II : return 'tiff';
           case
IMAGETYPE_TIFF_MM : return 'tiff';
           case
IMAGETYPE_JPC    : return 'jpc';
           case
IMAGETYPE_JP2    : return 'jp2';
           case
IMAGETYPE_JPX    : return 'jpf';
           case
IMAGETYPE_JB2    : return 'jb2';
           case
IMAGETYPE_SWC    : return 'swc';
           case
IMAGETYPE_IFF    : return 'aiff';
           case
IMAGETYPE_WBMP    : return 'wbmp';
           case
IMAGETYPE_XBM    : return 'xbm';
           default                : return
false;
       }
   }
}
?>
up
-1
mail at spybreak dot de
10 years ago
In case your PHP doesn't have this function, you can use this:
<?

if(!function_exists('image_type_to_extension'))
{
    function
image_type_to_extension($imagetype,$include_dot=true)
    {
        if(empty(
$imagetype)) return false;
       
$dot = $include_dot ? $dot.'' : '';
        switch(
$imagetype)
        {
            case
IMAGETYPE_GIF     : return $dot.'gif';
            case
IMAGETYPE_JPEG    : return $dot.'jpg';
            case
IMAGETYPE_PNG     : return $dot.'png';
            case
IMAGETYPE_SWF     : return $dot.'swf';
            case
IMAGETYPE_PSD     : return $dot.'psd';
            case
IMAGETYPE_WBMP    : return $dot.'wbmp';
            case
IMAGETYPE_XBM     : return $dot.'xbm';
            case
IMAGETYPE_TIFF_II : return $dot.'tiff';
            case
IMAGETYPE_TIFF_MM : return $dot.'tiff';
            case
IMAGETYPE_IFF     : return $dot.'aiff';
            case
IMAGETYPE_JB2     : return $dot.'jb2';
            case
IMAGETYPE_JPC     : return $dot.'jpc';
            case
IMAGETYPE_JP2     : return $dot.'jp2';
            case
IMAGETYPE_JPX     : return $dot.'jpf';
            case
IMAGETYPE_SWC     : return $dot.'swc';
            default                : return
false;
        }
    }
}
?>
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