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。

示例 #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`

注意: 本函数不需要 GD 库。

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

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User Contributed Notes 3 notes

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slegersjohn at gmail dot com ¶

8 years ago


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.

down

-10

benshelock at gmail dot com ¶

13 years ago


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;

}

?>

down

-22

kissrat at gmail dot com ¶

8 years ago


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"
);

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官方地址：https://www.php.net/manual/en/function.image-type-to-mime-type.php

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image_type_to_mime_type

说明

User Contributed Notes 3 notes