wp_get_image_mime( string $file ): string|false
Returns the real mime type of an image file.
Description
This depends on exif_imagetype() or getimagesize() to determine real mime types.
Parameters
-
$file
string Required -
Full path to the file.
Return
string|false The actual mime type or false if the type cannot be determined.
Source
File: wp-includes/functions.php
.
View all references
function wp_get_image_mime( $file ) {
/*
* Use exif_imagetype() to check the mimetype if available or fall back to
* getimagesize() if exif isn't available. If either function throws an Exception
* we assume the file could not be validated.
*/
try {
if ( is_callable( 'exif_imagetype' ) ) {
$imagetype = exif_imagetype( $file );
$mime = ( $imagetype ) ? image_type_to_mime_type( $imagetype ) : false;
} elseif ( function_exists( 'getimagesize' ) ) {
// Don't silence errors when in debug mode, unless running unit tests.
if ( defined( 'WP_DEBUG' ) && WP_DEBUG
&& ! defined( 'WP_RUN_CORE_TESTS' )
) {
// Not using wp_getimagesize() here to avoid an infinite loop.
$imagesize = getimagesize( $file );
} else {
$imagesize = @getimagesize( $file );
}
$mime = ( isset( $imagesize['mime'] ) ) ? $imagesize['mime'] : false;
} else {
$mime = false;
}
if ( false !== $mime ) {
return $mime;
}
$magic = file_get_contents( $file, false, null, 0, 12 );
if ( false === $magic ) {
return false;
}
/*
* Add WebP fallback detection when image library doesn't support WebP.
* Note: detection values come from LibWebP, see
* https://github.com/webmproject/libwebp/blob/master/imageio/image_dec.c#L30
*/
$magic = bin2hex( $magic );
if (
// RIFF.
( str_starts_with( $magic, '52494646' ) ) &&
// WEBP.
( 16 === strpos( $magic, '57454250' ) )
) {
$mime = 'image/webp';
}
} catch ( Exception $e ) {
$mime = false;
}
return $mime;
}
Changelog
Version | Description |
---|---|
5.8.0 | Added support for WebP images. |
4.7.1 | Introduced. |