centos让php支持Unicode properties support
自带的安装时时没带--enable-unicode-properties参数，需要下载下面的版本64bit - http://gaarai.com/wp-content/uploads/2009/01/pcre-66-27x86_64.rpm
32bit - http://gaarai.com/wp-content/uploads/2009/01/pcre-6.6-2.7.i386.rpm
安装：
rpm -Uvh pcre-66-27x86_64.rpm
或rpm -Uvh pcre-6.6-2.7.i386.rpm
检测：
# pcretest -C
PCRE version 6.6 06-Feb-2006
Compiled with
UTF-8 support
Unicode properties support
Newline character is LF
Internal link size = 2
POSIX malloc threshold = 10
Default match limit = 10000000
Default recursion depth limit = 10000000
Match recursion uses stack
完成
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