image_type_to_mime

说明

string image_type_to_mime_type ( int imagetype )

image_type_to_mime_type() 函数可以判断一个 IMAGETYPE 常量的 MIME 类型。
例子 1. image_type_to_mime_type (file)
<?php header("Content-type: " . image_type_to_mime_type(IMAGETYPE_PNG)); ?>

返回值如下：

表格 1. 返回值常量

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`

注: 本函数不需要 GD 库。

参见 getimagesize()，exif_imagetype()，exif_read_data() 和 exif_thumbnail()。

add a note User Contributed Notes

Lszl Balaton
16-Jul-2006 05:43


In certain cases, e.g. with using Internet Explore, this function returns with the value "image/pjpeg".



Using exactly the same picture, on Mozilla based browsers this function returns with the value "image/jpeg".



Note the difference "p" before the slash.



I think it is only true with images created by digital camera and transformed by special softwares, e.g. Photoshop.



However, I think, it is worth to pay attention to this small difference.

aidan at php dot net
11-Sep-2004 04:04


This functionality is now implemented in the PEAR package PHP_Compat.



More information about using this function without upgrading your version of PHP can be found on the below link:



http://pear.php.net/package/PHP_Compat

add a note