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PHP : Function Reference : Image Functions : imagetypes

imagetypes

Return the image types supported by this PHP build (PHP 4 >= 4.0.2, PHP 5)
int imagetypes ( )

Returns the image types supported by the current PHP installation.

Return Values

Returns a bit-field corresponding to the image formats supported by the version of GD linked into PHP. The following bits are returned, IMG_GIF | IMG_JPG | IMG_PNG | IMG_WBMP | IMG_XPM.

Examples

Example 1027. Checking for PNG support

<?php
if (imagetypes() & IMG_PNG) {
   echo
"PNG Support is enabled";
}
?>


Code Examples / Notes » imagetypes

enyo

Why not use this function?
<?php
function getSupportedImageTypes() {
   $aSupportedTypes = array();
   $aPossibleImageTypeBits = array(
       IMG_GIF=>'GIF',
       IMG_JPG=>'JPG',
       IMG_PNG=>'PNG',
       IMG_WBMP=>'WBMP'
   );
   foreach ($aPossibleImageTypeBits as $iImageTypeBits => $sImageTypeString) {
       if (imagetypes() & $iImageTypeBits) {
           $aSupportedTypes[] = $sImageTypeString;
       }
   }
   return $aSupportedTypes;
}
?>


jaldinger

Please note that if only "GIF Read Support" is enabled, the
IMG_GIF bit will not be returned (at least on my system:
PHP 4.3.0/RH Linux 7.2).
To work around this issue, and also the issue that there is no
function that can tell me what image format a GD resource ID
refers to, I use the following switch statement to map the exif
IMAGETYPE_* constants to the GD IMG_* constants:
switch (exif_imagetype($file['tmp_name'])) {
   case IMAGETYPE_GIF:
       $image_type = IMG_GIF;
       break;
   case IMAGETYPE_JPEG:
       $image_type = IMG_JPG;
       break;
   case IMAGETYPE_PNG:
       $image_type = IMG_PNG;
       break;
   case IMAGETYPE_WBMP:
       $image_type = IMG_WBMP;
       break;
    default:
       $image_type = 0;
       break;
}
store this value together with the image data in a database
and later use the following IF statement to see if I can work
with that image (create a thumbnail, etc...)
if ($image_type & (imagetypes() | IMG_GIF)) {
   return $this->createJpegThumbailFromString($data, 46, 27);
} else {
   return file_get_contents($_SERVER['DOCUMENT_ROOT'] .
       '/gfx/no-thumbnail.jpg');
}
HTH anybody...
Joerg.


thundercrew

Im not a smart man but this seemd to be the simplest code and it worked.
Its at the very top of this directory.
<?php
var_dump(gd_info());
?>
Returned image info and more.
array(11) { ["GD Version"]=> string(27) "bundled (2.0.28 compatible)" ["FreeType Support"]=> bool(true) ["FreeType Linkage"]=> string(13) "with freetype" ["T1Lib Support"]=> bool(false) ["GIF Read Support"]=> bool(true) ["GIF Create Support"]=> bool(true) ["JPG Support"]=> bool(true) ["PNG Support"]=> bool(true) ["WBMP Support"]=> bool(true) ["XBM Support"]=> bool(true) ["JIS-mapped Japanese Font Support"]=> bool(false) }


jocke

I wrote this function that returns an array with the supported image types
<?php
function getSupportedImageTypes() {
       $aSupportedTypes = array();
       
       $aPossibleImageTypeBits = array(
               "IMG_GIF",
               "IMG_JPG",
               "IMG_PNG",
               "IMG_WBMP"
           );
           
       foreach ($aPossibleImageTypeBits as $iIndex => $sImageTypeBits) {
           
           $sEval  = "if (";
           $sEval .= "imagetypes() & " . $sImageTypeBits . "";
           $sEval .= ") { return TRUE; } else { return FALSE; }";
           
           if (eval($sEval)) {
               $aSupportedTypes[] = str_replace("IMG_", "", $sImageTypeBits);
           }
       }
       
       return $aSupportedTypes;
   }
?>
Hope that helps someone :)
/Jocke Selin
PS, if you know of a better way that doesn't include eval(), please let me know.


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