PHP Passthru The Essential Guide to Command Execution and Output Capture

I have a very simple php web page. All I am doing is calling exec("python StartCamera.py", $arrayOutput, $nReturn); and then echoing the results. All I get is ... $tmp = exec("convert \"{$strPDF}\" -resize 500X500 \"{$strOut}\"", $results);. However, this doesnt seem to work. No errors in the log file and ... To work around the passthrough problem, I tried using ob_start() and ob_get_clean() etc. and put pass thru in the middle. That does capture the ... $result = exec('ffmpeg -t 30 -acodec copy -i $inputfile $outputfile'); echo ... this will get image from some-video-input.avi. Code: ionic-hello-world@ ionic:build /home/vagrant/Code/Laravel/hybrid ... When using shell_exec you have to chain your "real" command with echo $? to get the exit status: $output_including_status = shell_exec("command 2>&1; echo $?");