>Sample code:
>
>         exec("$imagemagickPath/convert -geometry " .
>         "{$thumbnail_width}x{$thumbnail_height} " .
>         "$images_dir/$filename $images_dir/tb_$filename");
>
>where filename could be:
>/var/www/html/images/SPIN CoreRT1 to EX-JF1  (cw - kpi - KPI Performance
>Report(Weekly).png

More quotes! :)

The shell delimits tokens with whitespace, so you'd need to escape that
whitespace, or quote it, like so (untested):

        exec(sprintf('%s/concert -geometry %dx%d "%s/%s" "%s/tb_%s"',
                     $imagemagickPath,
                     $thumbnail_width, $thumbnail_height,
                     $images_dir, $filename,
                     $images_dir, $filename));

Note the extra quotes around the two filepaths.

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