php 5.4 不使用mysqlnd
由于微博在测试php5.4的相关性能，在5.4开始mysqlnd变成了默认的驱动，相关说明如下：
[*]PHP 5.4 has mysqlnd as default
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[*]As of PHP 5.4, the mysqlnd library is a php.net compile time default to all PHP MySQL extensions. Also, the php.net Windows team is using mysqlnd for the official PHP Windows distribution since mysqlnd became available in PHP 5.3.
[*]Advantages of using mysqlnd
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[*]The mysqlnd library is highly optimized for and tightly integrated into PHP. The MySQL Client Library cannot offer the same optimizations because it is a general-purpose client library.
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[*]The mysqlnd library is using PHP internal C infrastructure for seamless integration into PHP. In addition, it is using PHP memory management, PHP Streams (I/O abstraction) and PHP string handling routines. The use of PHP memory management by mysqlnd allows, for example, memory savings by using read-only variables (copy on write) and makes mysqlnd apply to PHP memory limits. Additional advantages include:
而原有的数据库密码限制导致mysqlnd无法使用，还得使用libmysql驱动,导致php5.4需重新编译，我查看相关configure，将mysqlnd禁用不好使，发现语法判定只要指定mysql支持且不指定相关mysql base设置就会把mysqlnd作为默认驱动 。
下面是该后的相关编译选项：
[*]--with-mysql=/usr \
[*]--with-mysqli=shared,/usr/bin/mysql_config
[*]--with-pdo-mysql=shared,/usr
后重新编译后测试生效
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