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이 문서에서는 PHP 중국어 웹사이트 매뉴얼 풀어 주다
(PHP 4 >= 4.0.2, PHP 5, PHP 7)
imagetypes — 返回当前 PHP 版本所支持的图像类型
本函数以比特字段方式返回与当前 PHP 版本关联的 GD
库所支持的图像格式。将返回以下结果, IMG_GIF
| IMG_JPG
| IMG_PNG
| IMG_WBMP
| IMG_XPM
。
例如要检查是否支持 PNG,这样做:
Example #1 imagetypes() 例子
<?php
if ( imagetypes () & IMG_PNG ) {
echo "PNG Support is enabled" ;
}
?>
[#1] ThunderCrew [2007-07-30 19:38:32]
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) }
[#2] enyo [2003-11-05 19:32:12]
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 $aSupportedTypes;
}
?>
[#3] jaldinger (at) consulturdorado (dot) com [2003-01-08 12:31:14]
Please note that if only "GIF Read Support" is enabled, the
IMG_GIF bit will not be returned (at least on my system:
PHP 4.3.0/RH Linux 7.2).
To work around this issue, and also the issue that there is no
function that can tell me what image format a GD resource ID
refers to, I use the following switch statement to map the exif
IMAGETYPE_* constants to the GD IMG_* constants:
switch (exif_imagetype($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.