<?php

$con = mysql_connect("localhost","root","root");

mysql_select_db("my_db", $con);

$sql=array(

        "all"=>"select * from tables",

        "where"=>"select * from tables where id = {id}",

        "page"=>"select * from tables limit {a},{b}",

        "add"=>"INSERT INTO tables (name) VALUES ('{name}')"

    );

?>

<?php

    include("sql.php");

    foreach ($sql as $key=>$value){

        if(@$_GET['action']==$key){

            $a = str_replace("{","\".\$_GET['",$value);

            $b = str_replace("}","'].\"",$a);

        }

    }    

    eval("\$sql = \"".$b."\";");$result = mysql_query($sql);

    while(@$row = mysql_fetch_array($result)){

      $json = json_encode($row);

      echo $json;

    }

?>