CentOS5 下安装Apache2+PHP5+MySQL
安装apache
# tar -zvxf httpd-2.2.14.tar.gz
# cd httpd-2.2.14
# ./configure --prefix=/usr/local/apache2 --enable-so --enable-rewrite
# make
# make install
安装MySQL
#yum -y install mysql-server
#yum -y install mysql-devel
安装 jpeg7
建立目录：
# mkdir -p /usr/local/jpeg7
# mkdir -p /usr/local/jpeg7/bin
# mkdir -p /usr/local/jpeg7/lib
# mkdir -p /usr/local/jpeg7/include
# mkdir -p /usr/local/jpeg7/man
# mkdir -p /usr/local/jpeg7/man1
# mkdir -p /usr/local/jpeg7/man/man1
# tar -zvxf jpegsrc.v7.tar.gz
# cd jpeg-7
# ./configure --prefix=/usr/local/jpeg7/ --enable-shared --enable-static
# make; make install
安装libpng
# tar -zvxf libpng-1.2.40.tar.gz
# cd libpng-1.2.40
# cp scripts/makefile.linux makefile
# make
# make install
安装 freetype
# tar -zvxf freetype-2.1.10.tar.gz
# cd freetype-2.1.10
# mkdir -p /usr/local/freetype
# ./configure --prefix=/usr/local/freetype
# make
# make install
安装zlib
#tar -zxvf zlib-1.2.3.tar.gz
#cd zlib.1.2.3
# ./configure
# make
# make install
安装GD库
# tar -zvxf gd-2.0.35.tar.gz
# cd gd-2.0.35
# ./configure --prefix=/usr/local/gd2 --with-jpeg=/usr/local/jpeg7/ --with-png=/usr/local/lib/ --with-zlib=/usr/local/lib/ --with-freetype=/usr/local/freetype/
# make
# make install
安装PHP
# rpm -ivh libxml2-2.6.26-2.1.2.8.i386.rpm
# rpm -ivh libxml2-devel-2.6.26-2.1.2.8.i386.rpm
# rpm -ivh pkgconfig-0.21-2.el5.i386.rpm
# yum -y install curl
# tar -zxvf php-5.2.10.tar.gz
# cd php-5.2.10
# ./configure --prefix=/usr/local/php --with-apxs2=/usr/local/apache2/bin/apxs --with-mysql=/usr/local/mysql --with-gd=/usr/local/gd2/ --with-curl --with-jpeg-dir=/usr/local/jpeg7 --with-freetype-dir=/usr/local/freetype/
#如果上面的登录发生 mysql configure failed 错误 则先执行下面的配置，再执行上面配置就行(好像是第一次执行不能包括GD库)
# ./configure --prefix=/usr/local/php --with-mysql=/usr/local/mysql
# make
# make install
# cp php.ini-recommended /usr/local/lib
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代码
//第一种方式
exec($cmd,$str,$result);
echo "result = $result <br/>";
if ($result != 0) {
echo "failed";
}
print_r($str);
#没有输出结果
//第二种方式
$output = shell_exec("/usr/bin/sudo /usr/bin/whoami 2>&1);
echo "output = ......
function getThumbs($filename,$savepath,$d_w,$d_h,$b,$img_name)
{
if($b)
{
$photourl = $savepath."/".$img_name;
}else
{
$photourl = ......
PHP程序员应该都知道连接MySQL数据库可以使用mysql_pconnect（永久连接）函数，使用数据库永久连接可以提高效率，但是实际应用中数据库永久连接往往会导致出现一些问题，通常的表现就是在大访问量的网站上时常发生断断续续的无法连接数据库的情况，出现类似＂Too many connections in ...＂的错误提示信息，重新启动服务器� ......
