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<?php |
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/** |
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* ImageMimeTypeGuesser - Detect / guess mime type of an image |
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* |
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* @link https://github.com/rosell-dk/image-mime-type-guesser |
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* @license MIT |
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*/ |
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namespace ImageMimeTypeGuesser; |
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class GuessFromExtension |
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{ |
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/** |
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* Make a wild guess based on file extension. |
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* |
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* - and I mean wild! |
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* |
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* Only most popular image types are recognized. |
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* Many are not. See this list: https://www.iana.org/assignments/media-types/media-types.xhtml |
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* - and the constants here: https://secure.php.net/manual/en/function.exif-imagetype.php |
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* |
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* If no mapping found, nothing is returned |
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* |
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* TODO: jp2, jpx, ... |
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* Returns: |
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* - mimetype (if file extension could be mapped to an image type), |
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* - false (if file extension could be mapped to a type known not to be an image type) |
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* - null (if file extension could not be mapped to any mime type, using our little list) |
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* |
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* @param string $filePath The path to the file |
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* @return string|false|null mimetype (if file extension could be mapped to an image type), |
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* false (if file extension could be mapped to a type known not to be an image type) |
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* or null (if file extension could not be mapped to any mime type, using our little list) |
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*/ |
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public static function guess($filePath) |
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{ |
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if (!@file_exists($filePath)) { |
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return false; |
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} |
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/* |
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Not using pathinfo, as it is locale aware, and I'm not sure if that could lead to problems |
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if (!function_exists('pathinfo')) { |
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// This is really a just in case! - We do not expect this to happen. |
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// - in fact we have a test case asserting that this does not happen. |
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return null; |
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// |
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$fileExtension = pathinfo($filePath, PATHINFO_EXTENSION); |
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$fileExtension = strtolower($fileExtension); |
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}*/ |
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$result = preg_match('#\\.([^.]*)$#', $filePath, $matches); |
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if ($result !== 1) { |
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return null; |
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} |
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$fileExtension = $matches[1]; |
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// Trivial image mime types |
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if (in_array($fileExtension, ['bmp', 'gif', 'jpeg', 'png', 'tiff', 'webp'])) { |
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return 'image/' . $fileExtension; |
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} |
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// Common extensions that are definitely not images |
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if (in_array($fileExtension, ['txt', 'doc', 'zip', 'gz', 'exe'])) { |
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return false; |
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} |
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// Non-trivial image mime types |
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switch ($fileExtension) { |
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case 'ico': |
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return 'image/vnd.microsoft.icon'; // or perhaps 'x-icon' ? |
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case 'jpg': |
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return 'image/jpeg'; |
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case 'svg': |
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return 'image/svg+xml'; |
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case 'tif': |
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return 'image/tiff'; |
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} |
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// We do not know this extension, return null |
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return null; |
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} |
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} |
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rosell-dk /
image-mime-type-guesser
