PHP7.4编译启用mbstring的mbregex

将PHP更新升级到最新的7.4版本之后，发现部分程序页面显示出问题，或直接500错误；经过查看日志，发现是调用mbstring相关函数失败导致，部分错误如下：

[root@JP-BLG apache]# tail -f logs/mail-error-2020_10_30.log
[Fri Oct 30 19:07:10.161064 2020] [php7:error] [pid 26821] [client 183.129.232.18:6006] PHP Fatal error:  Uncaught Error: Call to undefined function mb_split() in /path/www/postfixadmin/lib/smarty/libs/plugins/shared.mb_str_replace.php:47\nStack trace:\n#0 /path/www/postfixadmin/lib/smarty/libs/plugins/modifier.replace.php(34): smarty_mb_str_replace()\n#1 /path/www/postfixadmin/templates_c/298cf19cd0da4910f608e622b12cf6e7c686ab71_0.file.list.tpl.php(135): smarty_modifier_replace()\n#2 /path/www/postfixadmin/lib/smarty/libs/sysplugins/smarty_template_resource_base.php(123): content_5ead29218ea276_70462996()\n#3 /path/www/postfixadmin/lib/smarty/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode()\n#4 /path/www/postfixadmin/lib/smarty/libs/sysplugins/smarty_internal_template.php(216): Smarty_Template_Compiled->render()\n#5 /path/www/postfixadmin/lib/smarty/libs/sysplugins/smarty_internal_template.php(385): Smarty_Internal_Template->render()\n#6 /path/www/postfixadmin/templates_c/e0698bcff4fc477ab184abd3affc2831f492d1eb_0.file.index.tpl.php(45): Smarty_Internal_Template in /path/www/postfixadmin/lib/smarty/libs/plugins/shared.mb_str_replace.php on line 47, referer: https://mail.xvcat.com/postfix/edit.php?table=admin

 

由于mbstring本身是开启的，经过一番查找，是由于PHP在7.4版本之后，将mbregex相关的功能改为外部调用Oniguruma来实现，见管网说明：https://www.php.net/manual/en/mbstring.installation.php

知道原因之后，故先安装 Oniguruma 来支持mbregex：

wget https://github.com/kkos/oniguruma/releases/download/v6.9.5_rev1/onig-6.9.5_rev1.tar.gz
tar zxf onig-6.9.5_rev1.tar.gz -C /usr/local/src/
cd /usr/local/src/onig-6.9.5/
CFLAGS="-fPIC -O3" ./configure --prefix=/usr/local/onig
make -j `cat /proc/cpuinfo | grep processor | wc -l` && make install

然后重启编译配置PHP时，在PKG_CONFIG_PATH中添加onig的搜索路径，然后安装即可解决问题。

cd /usr/local/src/php-7.4.12/
PKG_CONFIG_PATH="/usr/local/lib/pkgconfig:/usr/local/libxml2/lib/pkgconfig:/usr/local/openssl/lib/pkgconfig:/usr/local/pcre2/lib/pkgconfig:/usr/local/curl/lib/pkgconfig:/usr/local/gd/lib/pkgconfig:/usr/local/lib64/pkgconfig:/usr/local/onig/lib/pkgconfig" CFLAGS="-fPIC -O3" LDFLAGS="-Wl,--enable-new-dtags,-rpath=/usr/local/lib:/usr/local/openssl/lib:/usr/local/curl/lib:/usr/local/pcre2/lib:/usr/local/libxml2/lib:/usr/local/gd/lib:/usr/local/lib64" ./configure --prefix=/usr/local/php7 --with-apxs2=/usr/local/apache/bin/apxs --enable-fpm --with-fpm-user=apache --with-fpm-group=apache --with-fpm-systemd --enable-sigchild --enable-libgcc --with-openssl --with-external-pcre --with-pcre-jit --with-zlib --with-bz2=/usr/local/ --enable-calendar --with-curl --enable-gd --with-external-gd --enable-gd-jis-conv --with-gettext --with-mhash=/usr/local/ --with-mysqli=mysqlnd  --with-mysql-sock=/path/mariadb/mysql.sock --enable-pdo --with-pdo-mysql=mysqlnd --enable-mysqlnd --with-libedit=/usr/local/ --with-readline=/usr/local/ --with-expat=/usr/local/ --with-iconv-dir=/usr/local/ --with-zip --enable-mbstring=all --enable-bcmath --enable-exif --enable-ftp --enable-opcache --enable-intl --enable-pcntl --enable-shmop --enable-soap --enable-sockets --enable-sysvmsg --enable-sysvsem --enable-sysvshm --enable-inline-optimization --enable-maintainer-zts --enable-zend-signals --with-config-file-path=/usr/local/php7
make -j `cat /proc/cpuinfo | grep processor | wc -l` && make install
systemctl reload httpd

查看页面可正常显示，亦不会报错。