我在我的PHP 5.4.6上安装了pcntl，运行在Ubuntu 32位12.10上，使用本文
它并不顺利，因为在编译之后，当运行make test时，我得到了以下错误。每次我试图fork子进程时，我都会得到一个警告，上面写着:
警告:pcntl_fork()由于安全原因已在/var/www/mydev/dev/mailservicetest .php第8行被禁用
我在网上搜索了所有的解决方案，但不幸的是，我没有找到任何提到这个问题的其他地方。
Build complete.
Don't forget to run 'make test'.
PHP Warning: Module 'pcntl' already loaded in Unknown on line 0
PHP Warning: Module 'pcntl' already loaded in Unknown on line 0
=====================================================================
PHP : /usr/bin/php
Warning: Module 'pcntl' already loaded in Unknown on line 0
PHP_SAPI : cli
PHP_VERSION : 5.4.6-1ubuntu1.2
ZEND_VERSION: 2.4.0
PHP_OS : Linux - Linux oleg-Lenovo-G580 3.5.0-26-generic #42-Ubuntu SMP Fri Mar 8 23:20:06 UTC 2013 i686
INI actual : /php/php-5.4.6/ext/pcntl/tmp-php.ini
More .INIs :
CWD : /php/php-5.4.6/ext/pcntl
Extra dirs :
VALGRIND : Not used
=====================================================================
TIME START 2013-04-28 12:11:03
=====================================================================
FAIL Test pcntl wait functionality [tests/001.phpt]
FAIL pcntl: pcntl_sigprocmask(), pcntl_sigwaitinfo(), pcntl_sigtimedwait() [tests/002.phpt]
FAIL pcntl: SIG_BLOCK, SIG_UNBLOCK, SIG_SETMASK [tests/003.phpt]
FAIL Bug #47566 (return value of pcntl_wexitstatus()) [tests/bug47566.phpt]
FAIL pcntl_alarm() [tests/pcntl_alarm.phpt]
FAIL pcntl_exec() [tests/pcntl_exec.phpt]
FAIL pcntl_exec() 2 [tests/pcntl_exec_2.phpt]
FAIL pcntl_exec() 3 [tests/pcntl_exec_3.phpt]
FAIL Test function pcntl_fork() by calling it with its expected arguments [tests/pcntl_fork_basic.phpt]
FAIL Test function pcntl_fork() by testing the process isolation in the forking hierarchy father -> son -> grandson where father can not knows his grandson [tests/pcntl_fork_variation.phpt]
FAIL Test pcntl_get_last_error() [tests/pcntl_get_last_error.phpt]
FAIL pcntl_signal() [tests/pcntl_signal.phpt]
FAIL pcnt_signal_dispatch() [tests/pcntl_signal_dispatch.phpt]
FAIL pcntl_wait() [tests/pcntl_wait.phpt]
FAIL Closures as a signal handler [tests/signal_closure_handler.phpt]
=====================================================================
TIME END 2013-04-28 12:11:07
=====================================================================
TEST RESULT SUMMARY
---------------------------------------------------------------------
Exts skipped : 0
Exts tested : 44
---------------------------------------------------------------------
Number of tests : 15 15
Tests skipped : 0 ( 0.0%) --------
Tests warned : 0 ( 0.0%) ( 0.0%)
Tests failed : 15 (100.0%) (100.0%)
Expected fail : 0 ( 0.0%) ( 0.0%)
Tests passed : 0 ( 0.0%) ( 0.0%)
---------------------------------------------------------------------
Time taken : 4 seconds
=====================================================================
=====================================================================
FAILED TEST SUMMARY
---------------------------------------------------------------------
Test pcntl wait functionality [tests/001.phpt]
pcntl: pcntl_sigprocmask(), pcntl_sigwaitinfo(), pcntl_sigtimedwait() [tests/002.phpt]
pcntl: SIG_BLOCK, SIG_UNBLOCK, SIG_SETMASK [tests/003.phpt]
Bug #47566 (return value of pcntl_wexitstatus()) [tests/bug47566.phpt]
pcntl_alarm() [tests/pcntl_alarm.phpt]
pcntl_exec() [tests/pcntl_exec.phpt]
pcntl_exec() 2 [tests/pcntl_exec_2.phpt]
pcntl_exec() 3 [tests/pcntl_exec_3.phpt]
Test function pcntl_fork() by calling it with its expected arguments [tests/pcntl_fork_basic.phpt]
Test function pcntl_fork() by testing the process isolation in the forking hierarchy father -> son -> grandson where father can not knows his grandson [tests/pcntl_fork_variation.phpt]
Test pcntl_get_last_error() [tests/pcntl_get_last_error.phpt]
pcntl_signal() [tests/pcntl_signal.phpt]
pcnt_signal_dispatch() [tests/pcntl_signal_dispatch.phpt]
pcntl_wait() [tests/pcntl_wait.phpt]
Closures as a signal handler [tests/signal_closure_handler.phpt]
=====================================================================
You may have found a problem in PHP.
This report can be automatically sent to the PHP QA team at
http://qa.php.net/reports and http://news.php.net/php.qa.reports
This gives us a better understanding of PHP's behavior.
If you don't want to send the report immediately you can choose
option "s" to save it. You can then email it to qa-reports@lists.php.net later.
Do you want to send this report now? [Yns]: y
Please enter your email address.
(Your address will be mangled so that it will not go out on any
mailinglist in plain text): oleg.tt@gmail.com
Posting to http://qa.php.net/buildtest-process.php
Thank you for helping to make PHP better.
oleg@oleg-Lenovo-G580:/php/php-5.4.6/ext/pcntl$ version
当输入以下命令时，看起来PHP确实已经安装了，尽管PHP解释器在我安装这个扩展之前根本没有识别出这个函数:
oleg@oleg-Lenovo-G580:/php/php-5.4.6/ext/pcntl$ php -m | grep pcntl
PHP Warning: Module 'pcntl' already loaded in Unknown on line 0
pcntl
如何配置此功能使其正常工作?
sudo gedit
sudo gedit /etc/php5/cli/php.ini
或
sudo gedit /etc/php5/apache2/php.ini发现:
disable_functions = pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl
注释:
;disable_functions = pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl
我也有这个问题。Ubuntu在/usr/share/php5中附带了一些示例PHP配置文件:php.ini-production是Apache web服务器PHP配置(/etc/php5/apache2/php.ini)的模板，它禁用了pcntl_fork和其他功能。php.ini-production.cli是用于从命令行(/etc/php5/cli/php.ini)运行PHP的模板，包括在运行测试时，它不会禁用任何功能。但不知何故，我的/etc/php5/cli/php.ini是Apache配置的副本，它禁用了这些功能。
/etc/php5/cli/php.ini文件的日期是2013年10月，表明Ubuntu 13.10设置了它;也许那个版本复制了错误的文件。Ubuntu升级会更新/usr/share/php5中的示例文件，但会保留/etc/中的文件。
为了解决这个问题，我使用了
$ sudo cp -pi /usr/share/php5/php.ini-production.cli /etc/php5/cli/php.ini
复制默认的命令行设置文件。显然，如果您更改了PHP5命令行设置，则会覆盖它们;使用您的UNIX技能来区分和合并它们。