php连接mongodb
wget 'https://codeload.github.com/mongodb/mongo-php-driver/zip/master' -O /usr/local/src/mong_php.zip
cd /usr/local/src/
unzip mong_php.zip
cd mongo-php-driver-master/
/usr/local/php/bin/phpize
./configure --with-php-config=/usr/local/php/bin/php-config
make
make install
vi /usr/local/php/etc/php.ini    //增加 extension = mongo.so
/usr/local/php/bin/php -m
重启apache，重新加载php

测试：
vi /usr/local/apache2/htdocs/1.php  //增加

// 连接到mongodb
$m = new MongoClient();
echo "Connection to database successfully";
// 选择一个数据库
$db = $m->mydb;
echo "Database mydb selected";
?>

访问  curl localhost/1.php   如果输出
Connection to database successfullyDatabase mydb selected
说明正确。

更多测试访问http://www.runoob.com/mongodb/mongodb-php.html

扩展： mongodb分片   http://www.lanceyan.com/tech/arch/mongodb_shard1.html