(PHP 4 >= 4.3.0, PHP 5)
exif_imagetype — Determine the type of an image
$filename
)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
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.
Nota:
exif_imagetype() will emit an
E_NOTICEand returnFALSEif it is unable to read enough bytes from the file to determine the image type.
| Versione | Descrizione |
|---|---|
| 5.3.0 | Added icon support. |
| 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:
| 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 |
| 17 | IMAGETYPE_ICO |
Example #1 exif_imagetype() example
<?php
if (exif_imagetype('image.gif') != IMAGETYPE_GIF) {
echo 'The picture is not a gif';
}
?>