note 69994 added to function.image-type-to-extension

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;
}
?>
----
Server IP: 83.138.144.80
Probable Submitter: 86.142.241.158
----
Manual Page -- http://www.php.net/manual/en/function.image-typ
e-to-extension.php
Edit        -- https://master
.php.net/note/edit/69994
Del: integrated  -- h
ttps://master.php.net/note/delete/69994/integrated
Del: useless     -- http
s://master.php.net/note/delete/69994/useless
Del: bad code    -- htt
ps://master.php.net/note/delete/69994/bad+code
Del: spam        -- https:/
/master.php.net/note/delete/69994/spam
Del: non-english -- 
https://master.php.net/note/delete/69994/non-english
Del: in docs     -- http
s://master.php.net/note/delete/69994/in+docs
Del: other reasons-- https://mast
er.php.net/note/delete/69994
Reject      -- https://mast
er.php.net/note/reject/69994
Search      -- https://
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