|
|
|
|
Bookmark this on Delicious
Share on Facebook
 Slashdot It!
Digg  image_type_to_extension
Get file extension for image type
(PHP 5)
Code Examples / Notes » image_type_to_extensionaleksandrs dot bogdanovs
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. ian paul short chukdocsathotmaildotcom
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 $extension; } ?> neil
refining the homebrew method a little further, i wound up with this version. note that i had to change the case statements from previous version to include call to image_type_to_mime_type() <?php public static function imageTypeToExtension($imageType, $includeDot = false) { $dot = $includeDot ? '.' : ''; $ext = false; if(!empty($imageType)) { switch($imageType) { case image_type_to_mime_type(IMAGETYPE_GIF) : $ext = $dot.'gif'; break; case image_type_to_mime_type(IMAGETYPE_JPEG) : $ext = $dot.'jpg'; break; case image_type_to_mime_type(IMAGETYPE_PNG) : $ext = $dot.'png'; break; case image_type_to_mime_type(IMAGETYPE_SWF) : $ext = $dot.'swf'; break; case image_type_to_mime_type(IMAGETYPE_PSD) : $ext = $dot.'psd'; break; case image_type_to_mime_type(IMAGETYPE_WBMP) : $ext = $dot.'wbmp'; break; case image_type_to_mime_type(IMAGETYPE_XBM) : $ext = $dot.'xbm'; break; case image_type_to_mime_type(IMAGETYPE_TIFF_II) : $ext = $dot.'tiff'; break; case image_type_to_mime_type(IMAGETYPE_TIFF_MM) : $ext = $dot.'tiff'; break; case image_type_to_mime_type(IMAGETYPE_IFF) : $ext = $dot.'aiff'; break; case image_type_to_mime_type(IMAGETYPE_JB2) : $ext = $dot.'jb2'; break; case image_type_to_mime_type(IMAGETYPE_JPC) : $ext = $dot.'jpc'; break; case image_type_to_mime_type(IMAGETYPE_JP2) : $ext = $dot.'jp2'; break; case image_type_to_mime_type(IMAGETYPE_JPX) : $ext = $dot.'jpf'; break; case image_type_to_mime_type(IMAGETYPE_SWC) : $ext = $dot.'swc'; break; } } return $ext; } ?> robe
neil: your version fails to make sense for me spybreak.de guy: a) you left out BMP b) you fucked up the order of the extension in the mid of the listing. if this was changed in the getimagesize function during php versions, I'm sorry. Otherwise: WHY?! c) the include_dot stuff is the worst abuse of function arguments I've ever seen. Shame on you. Here's a unfucked, working version: <? if(!function_exists('image_type_to_extension')) { function image_type_to_extension($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; } } } ?> 19-apr-2005 01:11
Just an improvement/bugfix for the function below: <?php $dot = $include_dot ? $dot.'' : ''; //surely what was meant is....: $dot = $include_dot ? '.' : ''; ?> Because otherwise $dot always will be empty..... mail
In case your PHP doesn't have this function, you can use this: <? if(!function_exists('image_type_to_extension')) { function image_type_to_extension($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; } } } ?> oridan
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. discerer
at aleksandrs note about mime checking i really hope that piece of code isn't used as some kind of security check for uploading (excluding those which have no value in the switch-case ie), as the mime type in uploading could be very easily changed and btw if you want to get the extension why not just use substr to get all the text after the last dot in the filename to be really sure that the file is really what the mime says? this could be done easily with <?php $filename = "roflhax.pwnage.jpeg"; if (($pos = strrpos($filename, ".")) === FALSE) echo "Error - file doesn't have a dot... weird."; else { $extension = substr($filename, $pos + 1); echo $extension; // will echo "jpeg" } ?> (or you could use pathinfo() or a regex :)) ian paul short chukdocsathotmaildotcom
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. ian paul short
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; } } chris
- Function was added in PHP 5.2, not PHP 5 (you would assume this means 5.0) - Function returns .jpeg, not .jpg |
Change Language
gd_info getimagesize image_type_to_extension image_type_to_mime_type image2wbmp imagealphablending imageantialias imagearc imagechar imagecharup imagecolorallocate imagecolorallocatealpha imagecolorat imagecolorclosest imagecolorclosestalpha imagecolorclosesthwb imagecolordeallocate imagecolorexact imagecolorexactalpha imagecolormatch imagecolorresolve imagecolorresolvealpha imagecolorset imagecolorsforindex imagecolorstotal imagecolortransparent imageconvolution imagecopy imagecopymerge imagecopymergegray imagecopyresampled imagecopyresized imagecreate imagecreatefromgd2 imagecreatefromgd2part imagecreatefromgd imagecreatefromgif imagecreatefromjpeg imagecreatefrompng imagecreatefromstring imagecreatefromwbmp imagecreatefromxbm imagecreatefromxpm imagecreatetruecolor imagedashedline imagedestroy imageellipse imagefill imagefilledarc imagefilledellipse imagefilledpolygon imagefilledrectangle imagefilltoborder imagefilter imagefontheight imagefontwidth imageftbbox imagefttext imagegammacorrect imagegd2 imagegd imagegif imagegrabscreen imagegrabwindow imageinterlace imageistruecolor imagejpeg imagelayereffect imageline imageloadfont imagepalettecopy imagepng imagepolygon imagepsbbox imagepsencodefont imagepsextendfont imagepsfreefont imagepsloadfont imagepsslantfont imagepstext imagerectangle imagerotate imagesavealpha imagesetbrush imagesetpixel imagesetstyle imagesetthickness imagesettile imagestring imagestringup imagesx imagesy imagetruecolortopalette imagettfbbox imagettftext imagetypes imagewbmp imagexbm iptcembed iptcparse jpeg2wbmp png2wbmp |
