#41874 [Opn->Asn]: Separate STDOUT and STDERR in exec functions

ID: 41874 Updated by: jani@php.net -Summary: php (CLI) exec function passes no stderr output Reported By: ckeefer at us dot nomura dot com -Status: Open +Status: Assigned -Bug Type: CGI related +Bug Type: Feature/Change Request Operating System: Windows XP Pro SP2 PHP Version: 5.2CVS-2007-07-03 -Assigned To: +Assigned To: jani New Comment: Since this is actually improvement from previous behaviour where the output was mixed, I'm changing this to a FR. I'll look into adding an extra parameter to store STDERR in. In the meantime I suggest you use proc_open() or popen() which give you more control over these.. Previous Comments: ------------------------------------------------------------------------ [2007-07-18 13:01:40] ckeefer at us dot nomura dot com >Oddly, 5.2.2+ versions still work correctly with cygwin/bash 3.1 Using the same Win32 binary, not a Cygwin binary. To jani@php.net: That is a good suggestion for just getting STDERR output and I use it often on Unix and Linux systems when I need, and don't care if outputs are mixed. I haven't tested if this construct works with W32. Unfortunately, I need STDIN and STDERR separate. I also have a question: Did the version of compiler or libraries used to compile the binary change? MS is notorious for making undocumented changes to their development tools. Thanks, Chip Keefer ------------------------------------------------------------------------ [2007-07-18 08:45:45] jani@php.net This works fine with *nix (found from the user comments at http://www.php.net/manual/en/function.exec.php : <?php $com= "ls foo"; exec("$com 2>&1", $out, $err); var_dump($out); ?> I don't know if Windows supports something like this, but iirc, it should. ------------------------------------------------------------------------ [2007-07-03 12:56:37] ckeefer at us dot nomura dot com Thank you for the quick response. The new version still shows no STDERR output from a cmd.exe window. Thanks C:\php5.2fix>php test_exec.php Two exec statements: ------------------- This exec should result in error for non-existant dir: Array ( ) ----------------------- This exec works: -------------------- Array ( [0] => Volume in drive C is LOCAL DISK [1] => Volume Serial Number is 4054-8345 [2] => [3] => Directory of C:\php5.2fix [4] => [5] => 07/03/2007 08:08 AM 32,821 php.exe [6] => 1 File(s) 32,821 bytes [7] => 0 Dir(s) 58,549,849,088 bytes free ) C:\php5.2fix> C:\php5.2fix>type test_exec.php <?php echo "Two exec statements:\n-------------------\n"; echo "This exec should result in error for non-existant dir:\n"; exec("cd c:\\non_existant", $err); print_r($err); echo "-----------------------\n"; echo "This exec works:\n--------------------\n"; exec("dir php.exe", $ary); print_r($ary); ?> ------------------------------------------------------------------------ [2007-07-03 06:41:22] tony2001@php.net Please try using this CVS snapshot: http://snaps.php.net/php5.2-latest.tar.gz For Windows (zip): http://snaps.php.net/win32/php5.2-win32-latest.zip For Windows (installer): http://snaps.php.net/win32/php5.2-win32-installer-latest.msi ------------------------------------------------------------------------ [2007-07-02 18:39:25] ckeefer at us dot nomura dot com Description: ------------ PHP CLI version 5.1.8 thru 5.2.1 Windows Binary - exec() function, when error is generated passes STDERR no problem to CLI window. 5.2.2+ STDERR output has vanished. Nothing in documentation or search suggests what happened. No other changes 5.2.1 just downloaded and tested with generic setup (no php.ini or other modifications) stderr from exec() functions perfectly. 5.2.2+ system() apparently passes stderr properly, but is not useful for most of what we do. STDOUT appears to be fine all versions. Oddly, 5.2.2+ versions still work correctly with cygwin/bash 3.1 Note in 5.2.2 changelog contains this bit: - Fixed commandline handling for CLI and CGI. (Marcus, Johannes) Thanks, Chip Keefer Reproduce code: --------------- <?php $result = exec('cd c:\non_existant; dir nonexistant'); echo "$result\n"; ?> Expected result: ---------------- NJPC3916:php5.22$ php test_exec.php php test_exec.php The system cannot find the path specified. - Works properly with cygwin Actual result: -------------- C:\php5.22>php test_exec.php C:\php5.22> No STDERR ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=41874&edit=1