exif_imagetype
exif_imagetype() reads the first bytes of an image and checks its signature.
exif_imagetype() can be used to avoid calls to other exif functions with unsupported file types or in conjunction with $_SERVER['HTTP_ACCEPT'] to check whether or not the viewer is able to see a specific image in the browser.
filename
The image being checked.
When a correct signature is found, the appropriate constant value will be returned otherwise the return value is FALSE. The return value is the same value that getimagesize() returns in index 2 but exif_imagetype() is much faster.
| Версия | Описание |
|---|---|
| 4.3.2 | - Support for JPC, JP2, JPX, JB2, XBM, and WBMP |
| 4.3.0 | Support for SWC |
The following constants are defined, and represent possible exif_imagetype() return values:
Таблица 1. Imagetype Constants
| Value | Constant |
|---|---|
| 1 | IMAGETYPE_GIF |
| 2 | IMAGETYPE_JPEG |
| 3 | IMAGETYPE_PNG |
| 4 | IMAGETYPE_SWF |
| 5 | IMAGETYPE_PSD |
| 6 | IMAGETYPE_BMP |
| 7 | IMAGETYPE_TIFF_II (intel byte order) |
| 8 | - IMAGETYPE_TIFF_MM (motorola byte order) |
| 9 | IMAGETYPE_JPC |
| 10 | IMAGETYPE_JP2 |
| 11 | IMAGETYPE_JPX |
| 12 | IMAGETYPE_JB2 |
| 13 | IMAGETYPE_SWC |
| 14 | IMAGETYPE_IFF |
| 15 | IMAGETYPE_WBMP |
| 16 | IMAGETYPE_XBM |
|
Пример 1. exif_imagetype() example
|
| getimagesize() |
Exif Functions
exif_read_data
Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.
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