how to compile
 phpize
 ./configure
 make

you may need sapi/apache2handler/php_apache.h from php src 

in php.ini
 extension=pdo_namy_pool.so
 pdo_namy_pool.module_path="/usr/lib/mod_namy_pool.so"

sample
<?php
// namy_pool does not care what host adress is, just put user name as a connection pool name(you should set the name in httpd.conf)
$pdo = new PDO("namy_pool:host=localhost; unix_socket=/var/lib/mysql/mysql.sock; dbname=test","test");
$stmt = $pdo->query("SELECT * FROM test order by name $sort limit 1000");
{
    print $pdo->errorCode();
    print_r($pdo->errorInfo());
    exit;
}

while($row = $stmt->fetch(PDO::FETCH_ASSOC)){
    echo implode(", ", $row) . PHP_EOL;
}