本文操作环境：CentOS release 5.8系统，PHP5.6版，Dell G3电脑。
php怎么增加mysql扩展？
php 添加mysql扩展：
os：CentOS release 5.8 (Final)
php 版本：http://cn2.php.net/distributions/php-5.6.18.tar.gz
先yum安装libxml ，openssl ，mysql，mysql-devel 等。
网上搜索了下congfigure命令如下
./configure --prefix=/usr/local/php5 --with-config-file-path=/usr --with-mysql=/usr/include/mysql --with-mysqli=/usr/bin/mysql_config --with-libxml-dir=/usr/local/libxml2 --with-openssl
登录后复制报错：
Cannot find MySQL header files under /usr/include/mysql
登录后复制网上各种说法都尝试了，都没有用，后来我直接看configure文件为啥老这样报，
于是先grep 'error: Cannot find MySQL header files under' configure -n
发现出现这条日志的地方在这里：
./configure:
fi
if test "$PHP_MYSQL" = "yes" || test "$PHP_MYSQL" = "mysqlnd"; then
PHP_MYSQLND_ENABLED=yes
elif test "$PHP_MYSQL" != "no"; then
MYSQL_DIR=
MYSQL_INC_DIR=
if test -r $PHP_MYSQL/include/mysql/mysql.h; then
MYSQL_DIR=$PHP_MYSQL
MYSQL_INC_DIR=$PHP_MYSQL/include/mysql
break
elif test -r $PHP_MYSQL/include/mysql.h; then
MYSQL_DIR=$PHP_MYSQL
MYSQL_INC_DIR=$PHP_MYSQL/include
break
fi
if test -z "$MYSQL_DIR"; then
{ { $as_echo "$as_me:$LINENO: error: test Cannot find MySQL header files under $PHP_MYSQL.
Note that the MySQL client library is not bundled anymore!" >&5
$as_echo "$as_me: error: hgyang Cannot find MySQL header files under $PHP_MYSQL $MYSQL_DIR.
Note that the MySQL client library is not bundled anymore!" >&2;}
{ (exit 1); exit 1; }; }
fi登录后复制你妹啊！！！
原来 --with-mysql=/usr就可以了，include/mysql已经被包含了，哥瞬间泪奔了，好大一个坑。
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