note 110755 added to function.stream-set-blocking

It took me long time to "compile" this code, thanks to set blocking, we can write and read at the same time in proc_open(). Notice how the output from child begins after we feed several lines into it. Also notice that end lines are output *after* we do fclose($pipes[0]); Then we need to continue read until feof(), because fgets() may return false even there are more data to read. For educational reasons, I suggest you to try feeding small file (1-2 KB), medium file (4-5 MB) and huge file ( GB++ ). #!/usr/bin/php <? $max_buffer = 16 * 1024; $prog = 'cat'; $descr = array( 0 => array("pipe", "r"), // stdin 1 => array("pipe", "w"), // stdout 2 => array("file", "/dev/null", "a") // stderr ); $process = proc_open($prog, $descr, $pipes); foreach($pipes as $f) stream_set_blocking($f, 0); //stream_set_write_buffer($pipes[0], 1*1024*1024); $br = 0; while ( ($line = fgets(STDIN, $max_buffer)) !== false){ $br = $br + strlen($line); $ret = fwrite($pipes[0], $line); if ($ret == false){ echo "error, buffer full?\n"; } $s = fgets($pipes[1], $max_buffer); printf("%12.3f | ", $br / 1024); process_output($s); } //stream_set_blocking($pipes[1], 1); fclose($pipes[0]); while (! feof($pipes[1]) ){ $s = fgets($pipes[1], $max_buffer); if ($s === false) continue; printf("%12s |", "end"); process_output($s); } fclose($pipes[1]); function process_output($s){ $s = trim($s); if (strlen($s) > 50) $s = substr($s, 0, 50) . " [crop]"; printf("%s\n", $s ? $s : "--none--"); } ---- Server IP: 89.190.194.18 Probable Submitter: 85.130.92.216 ---- Manual Page -- http://www.php.net/manual/en/function.stream-set-blocking.php Edit -- https://master.php.net/note/edit/110755 Del: integrated -- https://master.php.net/note/delete/110755/integrated Del: useless -- https://master.php.net/note/delete/110755/useless Del: bad code -- https://master.php.net/note/delete/110755/bad+code Del: spam -- https://master.php.net/note/delete/110755/spam Del: non-english -- https://master.php.net/note/delete/110755/non-english Del: in docs -- https://master.php.net/note/delete/110755/in+docs Del: other reasons-- https://master.php.net/note/delete/110755 Reject -- https://master.php.net/note/reject/110755 Search -- https://master.php.net/manage/user-notes.php