(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
image_type_to_mime_type — 取得 getimagesize，exif_read_data，exif_thumbnail，exif_imagetype 所返回的图像类型的 MIME 类型
$imagetype
) : stringimage_type_to_mime_type() 函数可以判断一个 IMAGETYPE 常量的 MIME 类型。
Example #1 image_type_to_mime_type (file)
<?php
header("Content-type: " . image_type_to_mime_type(IMAGETYPE_PNG));
?>
返回值如下：
图像类型（imagetype） |
返回值 |
|---|---|
IMAGETYPE_GIF |
image/gif |
IMAGETYPE_JPEG |
image/jpeg |
IMAGETYPE_PNG |
image/png |
IMAGETYPE_SWF |
application/x-shockwave-flash |
IMAGETYPE_PSD |
image/psd |
IMAGETYPE_BMP |
image/bmp |
IMAGETYPE_TIFF_II (intel byte order) |
image/tiff |
IMAGETYPE_TIFF_MM (motorola byte order)
|
image/tiff |
IMAGETYPE_JPC |
application/octet-stream |
IMAGETYPE_JP2 |
image/jp2 |
IMAGETYPE_JPX |
application/octet-stream |
IMAGETYPE_JB2 |
application/octet-stream |
IMAGETYPE_SWC |
application/x-shockwave-flash |
IMAGETYPE_IFF |
image/iff |
IMAGETYPE_WBMP |
image/vnd.wap.wbmp |
IMAGETYPE_XBM |
image/xbm |
Note: 本函数不需要 GD 库。
参见 getimagesize()，exif_imagetype()，exif_read_data() 和 exif_thumbnail()。
If you are working with Images only and you need mime type (e.g. for headers), then this is a fast and reliable technique:
<?php
$file = 'path/to/image.jpg';
$image_mime = image_type_to_mime_type(exif_imagetype($file));
?>
It will output true image mime type even if you rename your image file.
Map the image type enum to file extension:
$extensions = array(
IMAGETYPE_GIF => "gif",
IMAGETYPE_JPEG => "jpg",
IMAGETYPE_PNG => "png",
IMAGETYPE_SWF => "swf",
IMAGETYPE_PSD => "psd",
IMAGETYPE_BMP => "bmp",
IMAGETYPE_TIFF_II => "tiff",
IMAGETYPE_TIFF_MM => "tiff",
IMAGETYPE_JPC => "jpc",
IMAGETYPE_JP2 => "jp2",
IMAGETYPE_JPX => "jpx",
IMAGETYPE_JB2 => "jb2",
IMAGETYPE_SWC => "swc",
IMAGETYPE_IFF => "iff",
IMAGETYPE_WBMP => "wbmp",
IMAGETYPE_XBM => "xbm",
IMAGETYPE_ICO => "ico"
);
I was looking to detect the format of images, Im not sure if this is the best way but it works for me.
<?php
$filename = 'http://static.php.net/www.php.net/images/php.gif';
$size = getimagesize($filename);
switch ($size['mime']) {
case "image/gif":
echo "Image is a gif";
break;
case "image/jpeg":
echo "Image is a jpeg";
break;
case "image/png":
echo "Image is a png";
break;
case "image/bmp":
echo "Image is a bmp";
break;
}
?>