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<?php |
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namespace ImageMimeTypeGuesser\Detectors; |
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use ImageMimeTypeGuesser\Detectors\AbstractDetector; |
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abstract class AbstractDetector |
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{ |
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/** |
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* Try to detect mime type of image |
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* |
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* Returns: |
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* - mime type (string) (if it is in fact an image, and type could be determined) |
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* - false (if it is not an image type that the server knowns about) |
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* - null (if nothing can be determined) |
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* |
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* @param string $filePath The path to the file |
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* @return string|false|null mimetype (if it is an image, and type could be determined), |
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* false (if it is not an image type that the server knowns about) |
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* or null (if nothing can be determined) |
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*/ |
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abstract protected function doDetect($filePath); |
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/** |
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* Create an instance of this class |
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* |
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* @param string $filePath The path to the file |
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* @return static |
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*/ |
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public static function createInstance() |
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{ |
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return new static(); |
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} |
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/** |
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* Detect mime type of file (for images only) |
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* |
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* Returns: |
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* - mime type (string) (if it is in fact an image, and type could be determined) |
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* - false (if it is not an image type that the server knowns about) |
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* - null (if nothing can be determined) |
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* |
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* @param string $filePath The path to the file |
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* @return string|false|null mimetype (if it is an image, and type could be determined), |
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* false (if it is not an image type that the server knowns about) |
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* or null (if nothing can be determined) |
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*/ |
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public static function detect($filePath) |
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{ |
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if (!@file_exists($filePath)) { |
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return false; |
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} |
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return self::createInstance()->doDetect($filePath); |
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} |
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} |
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