['pipe','r'],1=>['pipe','w'],2=>['pipe','w']]; $p=proc_open($cmd,$ds,$pipes); fwrite($pipes[0],"To: root@tilde.club\r\nSubject: proc_open test\r\n\r\nhi\r\n"); fclose($pipes[0]); $stdout=stream_get_contents($pipes[1]); fclose($pipes[1]); $stderr=stream_get_contents($pipes[2]); fclose($pipes[2]); $rc=proc_close($p); var_dump(['rc'=>$rc,'stderr'=>$stderr,'sendmail_path'=>ini_get('sendmail_path')]);