image_type_to_mime_type

(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

说明

image_type_to_mime_type ( int $imagetype ) : string

image_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：

**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`

Note: 本函数不需要 GD 库。

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

User Contributed Notes

slegersjohn at gmail dot com 06-Mar-2014 04:39


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.

kissrat at gmail dot com 10-Oct-2013 05:06


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"

);

benshelock at gmail dot com 09-Mar-2009 11:08


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;


}


?>