How to Retrieve the Camera Information (Meta Data) from JPEG Images using PHP?

<php?
  function cameraUsed($imagePath) {
      $ext = strtolower(pathinfo($imagePath, PATHINFO_EXTENSION));
      // Check if the variable is set and if the file itself exists before continuing
      if ((isset($imagePath)) and (file_exists($imagePath)) and (($ext=='jpg') || ($ext=='jpeg'))) {
      
        // There are 2 arrays which contains the information we are after, so it's easier to state them both
        $exif_ifd0 = @read_exif_data($imagePath ,'IFD0' ,0);       
        $exif_exif = @read_exif_data($imagePath ,'EXIF' ,0);
        
        //error control
        $notFound = "";
        
        // Make 
        if (@array_key_exists('Make', $exif_ifd0)) {
          $camMake = $exif_ifd0['Make'];
        } else { $camMake = $notFound; }
        
        // Model
        if (@array_key_exists('Model', $exif_ifd0)) {
          $camModel = $exif_ifd0['Model'];
        } else { $camModel = $notFound; }
        
        // Exposure
        if (@array_key_exists('ExposureTime', $exif_ifd0)) {
          $camExposure = $exif_ifd0['ExposureTime'];
        } else { $camExposure = $notFound; }
  
        // Aperture
        if (@array_key_exists('ApertureFNumber', $exif_ifd0['COMPUTED'])) {
          $camAperture = $exif_ifd0['COMPUTED']['ApertureFNumber'];
        } else { $camAperture = $notFound; }
        
        // Date
        if (@array_key_exists('DateTime', $exif_ifd0)) {
          $camDate = $exif_ifd0['DateTime'];
        } else { $camDate = $notFound; }
        
        // ISO
        if (@array_key_exists('ISOSpeedRatings',$exif_exif)) {
          $camIso = $exif_exif['ISOSpeedRatings'];
        } else { $camIso = $notFound; }
        
        $return = array();
        $return['make'] = $camMake;
        $return['model'] = $camModel;
        $return['exposure'] = $camExposure;
        $return['aperture'] = $camAperture;
        $return['date'] = $camDate;
        $return['iso'] = $camIso;
        return $return;
      } 
      return false;
  }