src/Detectives/ImageGDDetective.php
protected function leadJPG()
	{
		$exif   = exif_imagetype($this->file) === IMAGETYPE_JPEG;

		if ($exif)
		{
			return $this->closeCase("jpg", "image/jpg");
		}

		return null;
	}
protected function leadJPG()
	{
		$exif   = exif_imagetype($this->file) === IMAGETYPE_JPEG;

		if ($exif)
		{
			return $this->closeCase("jpg", "image/jpg");
		}

		return null;
	}
protected function leadJPG ( ) { $ exif = exif_imagetype ( $ this -> file ) === IMAGETYPE_JPEG ; if ( $ exif ) { return $ this -> closeCase ( "jpg" , "image/jpg" ) ; } return null ; }
Checks if thise file is a JPG.

@return boolean|null
Checks if thise file is a JPG .