<?php
            exec("C:Program FilesImageMagick-6.8.9-Q16convert C:xampphtdocstestimagesa.jpg C:xampphtdocstestimagesb.jpg", $output, $return);
        ?>
It does not work.The a.jpg file exists. and I am using the browser to run the index.php file with the path
http://localhost/test/index.php
$output is blank and $return is 1.