安装pdo时遇到 --with-pdo-mysql 这个要指向mysql安装目录；可是我这台机器不安装mysql;
解决方法：
[root@localhost app]# yum install mysql-devel
在次检测编译
./configure --with-php-config=/usr/local/php/bin/php-config --with-pdo-mysql=/usr
原因是:
即便我们不按装mysql服务，但也得安装mysql客户端mysql-devel ; 否则 mysql.h头找不到，导致报错；
/usr/local/src/php-7.2.7/ext/pdo_mysql/pdo_mysql.c: In function ‘zm_startup_pdo_mysql’:
/usr/local/src/php-7.2.7/ext/pdo_mysql/pdo_mysql.c:138: error: ‘pdo_mysql_reverse_api’ undeclared (first use in this function)
/usr/local/src/php-7.2.7/ext/pdo_mysql/pdo_mysql.c:138: error: (Each undeclared identifier is reported only once
/usr/local/src/php-7.2.7/ext/pdo_mysql/pdo_mysql.c:138: error: for each function it appears in.)
make: *** [pdo_mysql.lo] Error 1