OSX中php多进程安装pcntl

php实现多进程，源文件：

<?php


$pid = pcntl_fork();
if($pid == -1){
	die('could not fork');
}else{
	if ($pid) {
		var_dump('parent:'.$pid);
		exit('parent');
	}else{
		var_dump('child:'.$pid);
		exit('child');
	}
}

?>

但运行提示出错：

andy@AndyMacBookPro:/usr/local/webdata/andy/php/duojincheng$ php pcntl.php
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php/extensions/no-debug-non-zts-20100525/pcntl.so' - dlopen(/usr/lib/php/extensions/no-debug-non-zts-20100525/pcntl.so, 9): image not found in Unknown on line 0
PHP Fatal error:  Call to undefined function pcntl_fork() in /usr/local/webdata/andy/php/duojincheng/pcntl.php on line 4
PHP Stack trace:
PHP   1. {main}() /usr/local/webdata/andy/php/duojincheng/pcntl.php:0
andy@AndyMacBookPro:/usr/local/webdata/andy/php/duojincheng$

这是因为我们本机的php环境中没有pcntl.so扩展，所以我们下面来为php安装此扩展：

首先了解下自己本机系统中的php-config在哪里：

Last login: Sun Sep 28 17:04:12 on ttys002

andy@AndyMacBookPro:~$ sudo find / -name php-config

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/bin/php-config

find: /dev/fd/3: Not a directory

find: /dev/fd/4: Not a directory

/Users/andy/Downloads/php-5.4.30/scripts/php-config

/usr/bin/php-config

/usr/local/bin/php-config

/usr/local/Cellar/php54/5.4.30/bin/php-config

andy@AndyMacBookPro:~$ ll /usr/bin/php-config

-rwxr-xr-x  1 root  wheel  3672  9 22 09:37 /usr/bin/php-config*

andy@AndyMacBookPro:~$ ll /usr/local/bin/php-config 

lrwxr-xr-x  1 andy  admin  37  7  1 13:04 /usr/local/bin/php-config@ -> ../Cellar/php54/5.4.30/bin/php-config

andy@AndyMacBookPro:~$ 

查看/usr/bin/php-config:

  1 #! /bin/sh

  2 

  3 SED="/usr/bin/sed"

  4 prefix="/usr"

  5 datarootdir="/usr/php"

  6 exec_prefix="${prefix}"

  7 version="5.4.30"

  8 vernum="50430"

  9 include_dir="${prefix}/include/php"

 10 includes="-I$include_dir -I$include_dir/main -I$include_dir/TSRM -I$include_dir/Zend -I$include_dir/ext -I$include_d   ir/ext/date/lib"

 11 ldflags="  -L/BinaryCache/FreeType/FreeType-18~1619/Root/usr/local/lib"

 12 libs="-lresolv  -lz -lexslt -ltidy -lresolv -ledit -lncurses -lldap -llber -liconv -liconv -lpng -lz -ljpeg -lcrypto     -lssl -lcrypto -lcurl -lbz2 -lz -lpcre -lcrypto -lssl -lcrypto -lm  -lxml2 -lgssapi_krb5 -lkrb5 -lk5crypto -lcom_er   r -lcurl -lxml2 -lfreetype -lz -lxml2 -lnetsnmp -lcrypto -lxml2 -lxml2 -lxml2 -lxml2 -lxml2 -lxml2 -lxml2 -lxslt"

 13 extension_dir='/usr/lib/php/extensions/no-debug-non-zts-20100525'

 14 man_dir=`eval echo /usr/share/man`

 15 program_prefix=""

 16 program_suffix=""

 17 exe_extension=""

 18 php_cli_binary=NONE

 19 php_cgi_binary=NONE

 20 configure_options=" '--prefix=/usr' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--disable-dependency-trac   king' '--sysconfdir=/private/etc' '--with-apxs2=/usr/sbin/apxs' '--enable-cli' '--with-config-file-path=/etc' '--wit   h-config-file-scan-dir=/Library/Server/Web/Config/php' '--with-libxml-dir=/usr' '--with-openssl=/usr' '--with-kerber   os=/usr' '--with-zlib=/usr' '--enable-bcmath' '--with-bz2=/usr' '--enable-calendar' '--disable-cgi' '--with-curl=/us   r' '--enable-dba' '--enable-ndbm=/usr' '--enable-exif' '--enable-fpm' '--enable-ftp' '--with-gd' '--with-freetype-di   r=/usr/local' '--with-jpeg-dir=/usr/local' '--with-png-dir=/usr/local' '--enable-gd-native-ttf' '--with-icu-dir=/usr   ' '--with-ldap=/usr' '--with-ldap-sasl=/usr' '--with-libedit=/usr' '--enable-mbstring' '--enable-mbregex' '--with-my   sql=mysqlnd' '--with-mysqli=mysqlnd' '--without-pear' '--with-pdo-mysql=mysqlnd' '--with-mysql-sock=/var/mysql/mysql   .sock' '--with-readline=/usr' '--enable-shmop' '--with-snmp=/usr' '--enable-soap' '--enable-sockets' '--enable-sqlit   e-utf8' '--enable-sysvmsg' '--enable-sysvsem' '--enable-sysvshm' '--with-tidy' '--enable-wddx' '--with-xmlrpc' '--wi   th-iconv-dir=/usr' '--with-xsl=/usr' '--enable-zend-multibyte' '--enable-zip' '--with-pcre-regex=/usr'"

 21 php_sapis=" apache2handler cli fpm"

 22 

 23 # Set php_cli_binary and php_cgi_binary if available

 24 for sapiin$php_sapis;do

 25   case$sapiin

 26   cli)

 27     php_cli_binary="${exec_prefix}/bin/${program_prefix}php${program_suffix}${exe_extension}"

 28     ;;

 29   cgi)

 30     php_cgi_binary="${exec_prefix}/bin/${program_prefix}php-cgi${program_suffix}${exe_extension}"

 31     ;;

 32   esac

 33 done

 34 

"/usr/bin/php-config" [readonly] 90L, 3672C

查看/usr/local/bin/php-config：

1 #! /bin/sh

  2 

  3 SED="/usr/local/Library/ENV/4.3/sed"

  4 prefix="/usr/local/Cellar/php54/5.4.30"

  5 datarootdir="/usr/local/Cellar/php54/5.4.30/php"

  6 exec_prefix="${prefix}"

  7 version="5.4.30"

  8 vernum="50430"

  9 include_dir="${prefix}/include/php"

 10 includes="-I$include_dir -I$include_dir/main -I$include_dir/TSRM -I$include_dir/Zend -I$include_dir/ext -I$include_d   ir/ext/date/lib"

 11 ldflags=" -L/usr/local/opt/zlib/lib -L/usr/local/opt/jpeg/lib -L/usr/local/opt/libpng/lib -L/usr/local/Cellar/freety   pe/2.5.3_1/lib -L/usr/local/Cellar/libpng/1.6.10/lib -L/usr/local/opt/gettext/lib -L/usr/local/opt/unixodbc/lib"

 12 libs="  -lz -lexslt -lresolv -ledit -lncurses -lldap -llber -liconv -liconv -lintl -lpng -lz -ljpeg -lcrypto -lssl -   lcrypto -lcurl -lbz2 -lz -lcrypto -lssl -lcrypto -lm  -lxml2 -lgssapi_krb5 -lkrb5 -lk5crypto -lcom_err -lcurl -lxml2     -lfreetype -lz -lbz2 -lpng16 -lodbc -lodbc -lxml2 -lnetsnmp -lcrypto -lxml2 -lxml2 -lxml2 -lxml2 -lxml2 -lxml2 -lxm    l2 -lxslt "

 13 extension_dir='/usr/local/Cellar/php54/5.4.30/lib/php/extensions/no-debug-non-zts-20100525'

 14 man_dir=`eval echo /usr/local/Cellar/php54/5.4.30/share/man`

 15 program_prefix=""

 16 program_suffix=""

 17 exe_extension=""

 18 php_cli_binary=NONE

 19 php_cgi_binary=NONE

 20 configure_options=" '--prefix=/usr/local/Cellar/php54/5.4.30' '--localstatedir=/usr/local/var' '--sysconfdir=/usr/lo   cal/etc/php/5.4' '--with-config-file-path=/usr/local/etc/php/5.4' '--with-config-file-scan-dir=/usr/local/etc/php/5.   4/conf.d' '--with-iconv-dir=/usr' '--enable-dba' '--with-ndbm=/usr' '--enable-exif' '--enable-soap' '--enable-wddx'    '--enable-ftp' '--enable-sockets' '--enable-zip' '--enable-shmop' '--enable-sysvsem' '--enable-sysvshm' '--enable-sy   svmsg' '--enable-mbstring' '--enable-mbregex' '--enable-bcmath' '--enable-calendar' '--with-zlib=/usr/local/opt/zlib   ' '--with-ldap' '--with-ldap-sasl=/usr' '--with-xmlrpc' '--with-kerberos=/usr' '--with-gd' '--enable-gd-native-ttf'   '--with-freetype-dir=/usr/local/opt/freetype' '--with-jpeg-dir=/usr/local/opt/jpeg' '--with-png-dir=/usr/local/opt/l   ibpng' '--with-gettext=/usr/local/opt/gettext' '--with-snmp=/usr' '--with-libedit' '--with-unixODBC=/usr/local/opt/u   nixodbc' '--with-pdo-odbc=unixODBC,/usr/local/opt/unixodbc' '--mandir=/usr/local/Cellar/php54/5.4.30/share/man' '--w   ith-mhash' '--with-curl' '--with-bz2=/usr' '--disable-debug' '--with-openssl=/usr' '--with-xsl=/usr' '--with-apxs2=/   usr/sbin/apxs' '--libexecdir=/usr/local/Cellar/php54/5.4.30/libexec' '--with-mysql-sock=/tmp/mysql.sock' '--with-mys   qli=mysqlnd' '--with-mysql=mysqlnd' '--with-pdo-mysql=mysqlnd' '--enable-pcntl'"

 21 php_sapis=" apache2handler cli cgi"

 22 

 23 # Set php_cli_binary and php_cgi_binary if available

 24 for sapiin$php_sapis;do

 25   case$sapiin

 26   cli)

 27     php_cli_binary="${exec_prefix}/bin/${program_prefix}php${program_suffix}${exe_extension}"

 28     ;;

 29   cgi)

 30     php_cgi_binary="${exec_prefix}/bin/${program_prefix}php-cgi${program_suffix}${exe_extension}"

 31     ;;

 32   esac

 33 done

 34 

 35 # Determine which (if any) php binary is available

 36 if test "$php_cli_binary"!= "NONE";then

 37   php_binary="$php_cli_binary"

 38 else

 39   php_binary="$php_cgi_binary"

 40 fi

 41 

 42 # Remove quotes

 43 configure_options=`echo$configure_options|$SED -e"s#'##g"`

 44 

 45 case "$1"in

 46 --prefix)

 47   echo$prefix;;

 48 --includes)

 49   echo$includes;;

 50 --ldflags)

 51   echo$ldflags;;

 52 --libs)

 53   echo$libs;;

 54 --extension-dir)

 55   echo$extension_dir;;

 56 --include-dir)

 57   echo$include_dir;;

 58 --php-binary)

 59   echo$php_binary;;

 60 --php-sapis)

 61   echo$php_sapis;;

 62 --configure-options)

 63   echo$configure_options;;

 64 --man-dir)

 65   echo$man_dir;;

 66 --version)

 67   echo$version;;

 68 --vernum)

 69   echo$vernum;;

 70 *)

 71   cat << EOF

 72 Usage: $0 [OPTION]

 73 Options:

 74   --prefix            [$prefix]

 75   --includes          [$includes]

 76   --ldflags           [$ldflags]

 77   --libs              [$libs]

 78   --extension-dir     [$extension_dir]

 79   --include-dir       [$include_dir]

 80   --man-dir           [$man_dir]

 81   --php-binary        [$php_binary]

 82   --php-sapis         [$php_sapis]

 83   --configure-options [$configure_options]

 84   --version           [$version]

 85   --vernum            [$vernum]

 86 EOF

 87   exit1;;

 88 esac

 89 

 90 exit 0

可以看出应该是/usr/local/bin/php-config 而不是 /usr/bin/php-config ，后者好像是个模板之类的东西。

然后我们就可以去编译php得到php的扩展pcntl ：

andy@AndyMacBookPro:~/Downloads/php-5.4.30/ext/pcntl$ phpize

Configuring for:

PHP Api Version:         20100412

Zend Module Api No:      20100525

Zend Extension Api No:   220100525

andy@AndyMacBookPro:~/Downloads/php-5.4.30/ext/pcntl$ ./configure --with-php-config=/usr/local/bin/php-config 

checking for grep that handles long lines and -e... /usr/bin/grep

checking for egrep... /usr/bin/grep -E

checking for a sed that does not truncate output... /usr/bin/sed

checking for cc... cc

checking whether the C compiler works... yes

checking for C compiler default output file name... a.out

checking for suffix of executables... 

checking whether we are cross compiling... no

checking for suffix of object files... o

checking whether we are using the GNU C compiler... yes

checking whether cc accepts -g... yes

checking for cc option to accept ISO C89... none needed

checking how to run the C preprocessor... cc -E

checking for icc... no

checking for suncc... no

checking whether cc understands -c and -o together... yes

checking for system library directory... lib

checking if compiler supports -R... no

checking if compiler supports -Wl,-rpath,... yes

checking build system type... i386-apple-darwin13.4.0

checking host system type... i386-apple-darwin13.4.0

checking target system type... i386-apple-darwin13.4.0

checking for PHP prefix... /usr/local/Cellar/php54/5.4.30

checking for PHP includes... -I/usr/local/Cellar/php54/5.4.30/include/php -I/usr/local/Cellar/php54/5.4.30/include/php/main -I/usr/local/Cellar/php54/5.4.30/include/php/TSRM -I/usr/local/Cellar/php54/5.4.30/include/php/Zend -I/usr/local/Cellar/php54/5.4.30/include/php/ext -I/usr/local/Cellar/php54/5.4.30/include/php/ext/date/lib

checking for PHP extension directory... /usr/local/Cellar/php54/5.4.30/lib/php/extensions/no-debug-non-zts-20100525

checking for PHP installed headers prefix... /usr/local/Cellar/php54/5.4.30/include/php

checking if debug is enabled... no

checking if zts is enabled... no

checking for re2c... no

configure: WARNING: You will need re2c 0.13.4 or later if you want to regenerate PHP parsers.

checking for gawk... no

checking for nawk... no

checking for awk... awk

checking if awk is broken... no

checking whether to enable pcntl support... yes, shared

checking for fork... yes

checking for waitpid... yes

checking for sigaction... yes

checking for getpriority... yes

checking for setpriority... yes

checking for wait3... yes

checking for sigprocmask... yes

checking for sigwaitinfo... no

checking for sigtimedwait... no

checking for ld used by cc... /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld

checking if the linker (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld) is GNU ld... no

checking for /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld option to reload object files... -r

checking for BSD-compatible nm... /usr/bin/nm

checking whether ln -s works... yes

checking how to recognize dependent libraries... pass_all

checking for ANSI C header files... yes

checking for sys/types.h... yes

checking for sys/stat.h... yes

checking for stdlib.h... yes

checking for string.h... yes

checking for memory.h... yes

checking for strings.h... yes

checking for inttypes.h... yes

checking for stdint.h... yes

checking for unistd.h... yes

checking dlfcn.h usability... yes

checking dlfcn.h presence... yes

checking for dlfcn.h... yes

checking the maximum length of command line arguments... 196608

checking command to parse /usr/bin/nm output from cc object... ok

checking for objdir... .libs

checking for ar... ar

checking for ranlib... ranlib

checking for strip... strip

checking for dsymutil... dsymutil

checking for nmedit... nmedit

checking for -single_module linker flag... yes

checking for -exported_symbols_list linker flag... yes

checking if cc supports -fno-rtti -fno-exceptions... yes

checking for cc option to produce PIC... -fno-common

checking if cc PIC flag -fno-common works... yes

checking if cc static flag -static works... no

checking if cc supports -c -o file.o... yes

checking whether the cc linker (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld) supports shared libraries... yes

checking dynamic linker characteristics... darwin13.4.0 dyld

checking how to hardcode library paths into programs... immediate

checking whether stripping libraries is possible... yes

checking if libtool supports shared libraries... yes

checking whether to build shared libraries... yes

checking whether to build static libraries... no

creating libtool

appending configuration tag "CXX" to libtool

configure: creating ./config.status

config.status: creating config.h

andy@AndyMacBookPro:~/Downloads/php-5.4.30/ext/pcntl$ make && make install

/bin/sh /Users/andy/Downloads/php-5.4.30/ext/pcntl/libtool --mode=compile cc  -I. -I/Users/andy/Downloads/php-5.4.30/ext/pcntl -DPHP_ATOM_INC -I/Users/andy/Downloads/php-5.4.30/ext/pcntl/include -I/Users/andy/Downloads/php-5.4.30/ext/pcntl/main -I/Users/andy/Downloads/php-5.4.30/ext/pcntl -I/usr/local/Cellar/php54/5.4.30/include/php -I/usr/local/Cellar/php54/5.4.30/include/php/main -I/usr/local/Cellar/php54/5.4.30/include/php/TSRM -I/usr/local/Cellar/php54/5.4.30/include/php/Zend -I/usr/local/Cellar/php54/5.4.30/include/php/ext -I/usr/local/Cellar/php54/5.4.30/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -c /Users/andy/Downloads/php-5.4.30/ext/pcntl/pcntl.c -o pcntl.lo 

mkdir .libs

 cc -I. -I/Users/andy/Downloads/php-5.4.30/ext/pcntl -DPHP_ATOM_INC -I/Users/andy/Downloads/php-5.4.30/ext/pcntl/include -I/Users/andy/Downloads/php-5.4.30/ext/pcntl/main -I/Users/andy/Downloads/php-5.4.30/ext/pcntl -I/usr/local/Cellar/php54/5.4.30/include/php -I/usr/local/Cellar/php54/5.4.30/include/php/main -I/usr/local/Cellar/php54/5.4.30/include/php/TSRM -I/usr/local/Cellar/php54/5.4.30/include/php/Zend -I/usr/local/Cellar/php54/5.4.30/include/php/ext -I/usr/local/Cellar/php54/5.4.30/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /Users/andy/Downloads/php-5.4.30/ext/pcntl/pcntl.c  -fno-common -DPIC -o .libs/pcntl.o

/bin/sh /Users/andy/Downloads/php-5.4.30/ext/pcntl/libtool --mode=compile cc  -I. -I/Users/andy/Downloads/php-5.4.30/ext/pcntl -DPHP_ATOM_INC -I/Users/andy/Downloads/php-5.4.30/ext/pcntl/include -I/Users/andy/Downloads/php-5.4.30/ext/pcntl/main -I/Users/andy/Downloads/php-5.4.30/ext/pcntl -I/usr/local/Cellar/php54/5.4.30/include/php -I/usr/local/Cellar/php54/5.4.30/include/php/main -I/usr/local/Cellar/php54/5.4.30/include/php/TSRM -I/usr/local/Cellar/php54/5.4.30/include/php/Zend -I/usr/local/Cellar/php54/5.4.30/include/php/ext -I/usr/local/Cellar/php54/5.4.30/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -c /Users/andy/Downloads/php-5.4.30/ext/pcntl/php_signal.c -o php_signal.lo 

 cc -I. -I/Users/andy/Downloads/php-5.4.30/ext/pcntl -DPHP_ATOM_INC -I/Users/andy/Downloads/php-5.4.30/ext/pcntl/include -I/Users/andy/Downloads/php-5.4.30/ext/pcntl/main -I/Users/andy/Downloads/php-5.4.30/ext/pcntl -I/usr/local/Cellar/php54/5.4.30/include/php -I/usr/local/Cellar/php54/5.4.30/include/php/main -I/usr/local/Cellar/php54/5.4.30/include/php/TSRM -I/usr/local/Cellar/php54/5.4.30/include/php/Zend -I/usr/local/Cellar/php54/5.4.30/include/php/ext -I/usr/local/Cellar/php54/5.4.30/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /Users/andy/Downloads/php-5.4.30/ext/pcntl/php_signal.c  -fno-common -DPIC -o .libs/php_signal.o

/bin/sh /Users/andy/Downloads/php-5.4.30/ext/pcntl/libtool --mode=link cc -DPHP_ATOM_INC -I/Users/andy/Downloads/php-5.4.30/ext/pcntl/include -I/Users/andy/Downloads/php-5.4.30/ext/pcntl/main -I/Users/andy/Downloads/php-5.4.30/ext/pcntl -I/usr/local/Cellar/php54/5.4.30/include/php -I/usr/local/Cellar/php54/5.4.30/include/php/main -I/usr/local/Cellar/php54/5.4.30/include/php/TSRM -I/usr/local/Cellar/php54/5.4.30/include/php/Zend -I/usr/local/Cellar/php54/5.4.30/include/php/ext -I/usr/local/Cellar/php54/5.4.30/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -o pcntl.la -export-dynamic -avoid-version -prefer-pic -module -rpath /Users/andy/Downloads/php-5.4.30/ext/pcntl/modules  pcntl.lo php_signal.lo 

cc ${wl}-flat_namespace ${wl}-undefined ${wl}suppress -o .libs/pcntl.so -bundle  .libs/pcntl.o .libs/php_signal.o  

dsymutil .libs/pcntl.so || :

creating pcntl.la

(cd .libs && rm -f pcntl.la && ln -s ../pcntl.la pcntl.la)

/bin/sh /Users/andy/Downloads/php-5.4.30/ext/pcntl/libtool --mode=install cp ./pcntl.la /Users/andy/Downloads/php-5.4.30/ext/pcntl/modules

cp ./.libs/pcntl.so /Users/andy/Downloads/php-5.4.30/ext/pcntl/modules/pcntl.so

cp ./.libs/pcntl.lai /Users/andy/Downloads/php-5.4.30/ext/pcntl/modules/pcntl.la

----------------------------------------------------------------------

Libraries have been installed in:

   /Users/andy/Downloads/php-5.4.30/ext/pcntl/modules

If you ever happen to want to link against installed libraries

in a given directory, LIBDIR, you must either use libtool, and

specify the full pathname of the library, or use the `-LLIBDIR'

flag during linking and do at least one of the following:

   - add LIBDIR to the `DYLD_LIBRARY_PATH' environment variable

     during execution

See any operating system documentation about shared libraries for

more information, such as the ld(1) and ld.so(8) manual pages.

----------------------------------------------------------------------

Build complete.

Don't forget to run 'make test'.

Installing shared extensions:     /usr/local/Cellar/php54/5.4.30/lib/php/extensions/no-debug-non-zts-20100525/

andy@AndyMacBookPro:~/Downloads/php-5.4.30/ext/pcntl$ cd /usr/local/Cellar/php54/5.4.30/lib/php/extensions/no-debug-non-zts-20100525/

andy@AndyMacBookPro:/usr/local/Cellar/php54/5.4.30/lib/php/extensions/no-debug-non-zts-20100525$ ll

total 400

drwxr-xr-x  4 andy  admin     136  9 28 18:53 ./

drwxr-xr-x  3 andy  admin     102  7 23 15:51 ../

-rw-r--r--  1 andy  admin  172732  7 23 15:51 apc.so

-rwxr-xr-x  1 andy  admin   26928  9 28 18:53 pcntl.so*

andy@AndyMacBookPro:/usr/local/Cellar/php54/5.4.30/lib/php/extensions/no-debug-non-zts-20100525$ 

然后我们就可以到后面的这个目录去寻找我们的扩展文件pcntl.so，然后我们把这个so文件copy一份儿到我们系统的php扩展目录中去就可以了。

目前的情况是这个目录恰巧就是我们本地php版本的扩展目录，所以就不用mv了。（后话：这是因为我们引用了php-config，目录当然统一了 >< ，我当时不知道）

然后我们要到php.ini中去修改文件加入：

 849 extension=/usr/local/Cellar/php54/5.4.30/lib/php/extensions/no-debug-non-zts-20100525/pcntl.so

(

这里我们用的时绝对路径，是因为这不是php默认的扩展加载路径，我本地php扩展的默认加载路径是：

/usr/lib/php/extensions/

比如我本地加载mssql.so在这里：

/usr/lib/php/extensions/no-debug-non-zts-20100525/mssql.so

)

然后重启apache服务器，即可。

pcntl

pcntl support	enabled

现在我们来执行最开始的脚本，执行了两次，结果如下：

andy@AndyMacBookPro:/usr/local/webdata/andy/php/duojincheng$ php pcntl.php
string(11) "parent:5576"
string(7) "child:0"
parentchildandy@AndyMacBookPro:/usr/local/webdata/andy/php/duojincheng$ php pcntl.php
string(11) "parent:5619"
parentstring(7) "child:0"
childandy@AndyMacBookPro:/usr/local/webdata/andy/php/duojincheng$