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11 years ago
I posted the original version of the function, but after using it for a while I discovered I didn't do enough error checking. 

I have re-factored it somewhat, and it now returns an empty array should it not be able to read the image's exif. If it is able to, it will return the details it was able to retrieve. And this should be without error. 

I am suppressing errors, because if you pass it images which cannot parse, you will get a warning. 

<?php 

# Modified Version of cameraUsed, no longer returns date. 
public function cameraUsed($imagePath)
{
    # The default empty return
    $return = array(
        'make'      => "",
        'model'     => "",
        'exposure'  => "",
        'aperture'  => "",
        'iso'       => ""
    );

    // Check if the variable is set and if the file itself exists before continuing
    if ((isset($imagePath)) AND (file_exists($imagePath)))
    {
        // 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);

        # Ensure that we actually got some information
        if (($exif_ifd0 !== false) AND ($exif_exif !== false))
        {
            // Make
            if (@array_key_exists('Make', $exif_ifd0))
            {
                $return['make']     = $exif_ifd0['Make'];
            }

            // Model
            if (@array_key_exists('Model', $exif_ifd0))
            {
                $return['model']    = $exif_ifd0['Model'];
            }

            // Exposure
            if (@array_key_exists('ExposureTime', $exif_ifd0))
            {
                $return['exposure'] = $exif_ifd0['ExposureTime'];
            }

            // Aperture
            if (@array_key_exists('ApertureFNumber', $exif_ifd0['COMPUTED']))
            {
                $return['aperture'] = $exif_ifd0['COMPUTED']['ApertureFNumber'];
            }

            // ISO
            if (@array_key_exists('ISOSpeedRatings',$exif_exif))
            {
                $return['iso']     = $exif_exif['ISOSpeedRatings'];
            }
        }
    }

    # Return either an empty array, or the details which we were able to extrapolate.
    return $return;
}

?>
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