ibiconv组件安装好了可以让我们php支持iconv函数了，这个函数的作用就是字符编码强制转换了，下面和111cn小编一起来看一个Linux中安装libiconv使php支持iconv函数的例子吧。
问题：
线上运行的lamp服务器，php不支持iconv函数。
解决方法：
安装libiconv，重新编译apache，使php支持iconv函数，实现utf-8和gb2312编码的转换。
具体步骤：
1、下载libiconv
cd /usr/local/src
wget http://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.14.tar.gz #下载
2、安装libiconv
cd /usr/local/src
tar zxvf libiconv-1.14.tar.gz #解压
cd libiconv-1.14 #进入安装目录
./configure –prefix=/usr/local/libiconv #配置
make #编译
make install #安装
3、重新编译php
查找系统之前的php编译参数
cd /usr/local/php/bin #进入php安装目录
./php -i |more #查看php编译参数
如下：
‘–with-pdo_sqlite=shared’ ‘–enable-bcmath=shared’ ‘–enable-ftp=shared’ ‘–enable-mbstring=shared’ ‘–with-iconv=shared’ ‘–enable-sockets=shared’ ‘–enable-zip’ ‘–enable-soap=s
hared’ ‘–with-openssl’ ‘–with-zlib’ ‘–with-curl=shared’ ‘–with-gd=shared’ ‘–with-jpeg-dir’ ‘–with-png-dir’ ‘–with-freetype-dir’ ‘–with-mcrypt=shared’ ‘–with-mhash=shared’ ‘–with-mysql=/ho
me/server/mysql’ ‘–with-mysqli=/home/server/mysql/bin/mysql_config’ ‘–with-pdo-mysql=/home/server/mysql/bin/mysql_config’ ‘–without-pear’ ‘–with-libdir=lib64’
对参数进行修改：
如下
./configure –prefix=/usr/local/php –with-config-file-path=/usr/local/php/etc –with-apxs2=/usr/local/apache/bin/apxs –with-gettext=shared –with-sqlite=shared –with-pdo_sqlite=shared –enable-bcmath=shared –enable-ftp=shared –enable-mbstring=shared –with-iconv-dir=/usr/local/libiconv –enable-sockets=shared –enable-zip –enable-soap=shared –with-openssl –with-zlib –with-curl=shared –with-gd=shared –with-jpeg-dir –with-png-dir –with-freetype-dir –with-mcrypt=shared –with-mhash=shared –with-mysql=/home/server/mysql –with-mysqli=/home/server/mysql/bin/mysql_config –with-pdo-mysql=/home/server/mysql/bin/mysql_config –without-pear –with-libdir=lib64
备注：修改部分
取消原来的–with-iconv=shared
替换为：–with-iconv-dir=/usr/local/libiconv
取消参数两边的单引号
其它不变
cd /usr/local/src/php #进入php安装包目录（注意php版本要和之前一样）
./configure –prefix=/usr/local/php –with-config-file-path=/usr/local/php/etc –with-apxs2=/usr/local/apache/bin/apxs –with-gettext=shared –with-sqlite=shared –with-pdo_sqlite=shared –enable-bcmath=shared –enable-ftp=shared –enable-mbstring=shared –with-iconv-dir=/usr/local/libiconv –enable-sockets=shared –enable-zip –enable-soap=shared –with-openssl –with-zlib –with-curl=shared –with-gd=shared –with-jpeg-dir –with-png-dir –with-freetype-dir –with-mcrypt=shared –with-mhash=shared –with-mysql=/home/server/mysql –with-mysqli=/home/server/mysql/bin/mysql_config –with-pdo-mysql=/home/server/mysql/bin/mysql_config –without-pear –with-libdir=lib64 #配置
make #编译
make install #安装
4、重启apache使设置生效
service httpd restart #重启
