PHP MySQL Dialogflow

Question

I'm setting up a chatbot (dialogflow) with a PHP webhook

What I want to do is to take the user input to query a MySQL table and pass the result back to the dialogflow API

So far I succeeded with passing a text string back to the API, but I don't understand how to query the database and pass the result back to the dialogflow API

I'll appreciate your help with this
I've used the API format from the dialogflow docs here

This is what I have

<?php
$method = $_SERVER['REQUEST_METHOD'];
if($method == 'POST') {
$requestBody = file_get_contents('php://input'); 
$json = json_decode($requestBody); 
$text = $json->result->parameters->cities;
$conn = mysqli_connect("xxx", "xxx", "xxx", "xxx"); 
    $sql = "SELECT * FROM exampletable LIKE '%".$_POST["cities"]."%'"; 
    $result = mysqli_query($conn, $sql);
    $emparray = array();
    while($row =mysqli_fetch_assoc($result)) {
        $emparray[] = $row;
    }
$speech = $emparray;
    $response->speech = $speech;
    $response->displayText = $speech;
    $response->source = "webhook";
    echo json_encode(array($response,$emparray));
else
{
    echo "Method not allowed";
}
 ?>

Thankyou

Answer 1

whenever the webhook gets triggered you need to listen to actions from JSON responses, from the action made the switch case of actions

index.php

<?php
require 'get_enews.php';

function processMessage($input) {
    $action = $input["result"]["action"];
    switch($action){

        case 'getNews':
            $param = $input["result"]["parameters"]["number"];
            getNews($param);
            break;

        default :
            sendMessage(array(
                "source" => "RMC",
                "speech" => "I am not able to understand. what do you want ?",
                "displayText" => "I am not able to understand. what do you want ?",
                "contextOut" => array()
            ));
    }
}
function sendMessage($parameters) {
    header('Content-Type: application/json');
    $data = str_replace('\/','/',json_encode($parameters));
    echo $data;
}
$input = json_decode(file_get_contents('php://input'), true);
if (isset($input["result"]["action"])) {
    processMessage($input);
}
?>

get_enews.php

<?php
function getNews($param){
    require 'config.php';
    $getNews="";
    $Query="SELECT link FROM public.news WHERE year='$param'";
    $Result=pg_query($con,$Query);
    if(isset($Result) && !empty($Result) && pg_num_rows($Result) > 0){
    $row=pg_fetch_assoc($Result);
    $getNews= "Here is details that you require - Link: " . $row["link"];
        $arr=array(
            "source" => "RMC",
            "speech" => $getNews,
            "displayText" => $getNews,
        );
        sendMessage($arr);
    }else{
        $arr=array(
            "source" => "RMC",
            "speech" => "No year matched in database.",
            "displayText" => "No year matched in database.",
        );
        sendMessage($arr);
    }
}
?>

So when the action gets caught it will get executed and goes in the getNews($param); function here I am getting year as a response from the user in my case and I am executing the query in the database and giving back a response from the database.