PHP 5.6.9 stream_get_contents usage

Mac output

20:49 starting
20:49 proc_open finished
22:19 stream_get_contents 1 finished
22:19 fclose 1 finished
22:19 stream_get_contents 2 finished
22:19 fclose 2 finished
22:19 proc_close finished
array(3) {
  ["stdout"]=>
  string(3) "bla"
  ["stderr"]=>
  string(0) ""
  ["exitCode"]=>
  int(0)
}

procrunner.php

<?php
printTimeStatus("starting");
$command = '"'.PHP_BINARY.'" slowscript.php';

$pipes = [];
$resource = proc_open($command, [1 => ["pipe", "w"],  2 => ["pipe", "w"]], $pipes);
printTimeStatus("proc_open finished");

$stdout = stream_get_contents($pipes[1]); 
printTimeStatus("stream_get_contents 1 finished");
fclose($pipes[1]);
printTimeStatus("fclose 1 finished");

$stderr = stream_get_contents($pipes[2]); 
printTimeStatus("stream_get_contents 2 finished");
fclose($pipes[2]);
printTimeStatus("fclose 2 finished");

$exitCode = proc_close($resource);
printTimeStatus("proc_close finished");

var_dump( ["stdout"=>$stdout, "stderr"=>$stderr, "exitCode"=>$exitCode] );

function printTimeStatus($msg)
{
	print date("i:s") . " $msg\n";
}

slowscript.php

<?php

sleep(90);
print "bla";

Windows output

20:52 starting
20:52 proc_open finished
21:27 stream_get_contents 1 finished
21:27 fclose 1 finished
22:03 stream_get_contents 2 finished
22:03 fclose 2 finished
22:22 proc_close finished
array(3) {
  ["stdout"]=>
  string(0) ""
  ["stderr"]=>
  string(0) ""
  ["exitCode"]=>
  int(0)
}