Unable to pass variable value to ajax from php - php

Question

My ajax:
$("document").ready(function(){
$(".form").submit(function(){
var data = {
"action": "test"
};
data = $(this).serialize() + "&" + $.param(data);
$.ajax({
type: "POST",
dataType: "json",
url: "response.php", //Relative or absolute path to response.php file
data: data,
success: function(data) {
//$(".the-return").html("<br />JSON: " + data["json"] );
// alert("Form submitted successfully.\nReturned json: " + data["json"]);
alert(data);
// window.location='success.php'
}
});
return false;
});
});
I declared a variable to store unique_id like this:
$unique_id=uniqid();
I'm inserting data like this:
try
{
$stmt2 = $pdo->prepare('INSERT INTO usrinfo (UUID,Name,Phone,Email,Postcode,DateReg,Reputation,ReviewPlus,ReviewNeg,Sex,Status,IsTuitionCentre) VALUES(:uuid,:name,:phone,:email,:poscode,now(),:reputation,:reviewplus,:reviewneg,:sex,:status,:permission)');
$stmt2->execute(array(
':uuid' => $unique_id,
':name'=>$name,
':phone'=>$phone,
':email'=>$email,
':poscode'=>$postcode,
':reputation'=>78,
':reviewplus'=>65,
':reviewneg'=>3,
':sex'=>$gender,
':status'=>0,
':permission'=>$permission
));
# Affected Rows?
echo $stmt2->rowCount(); // 1
} catch(PDOException $e) {
echo 'Error: ' . $e->getMessage();
}
Now, I want to pass the above unique_id to ajax page but couldn't.
echo $unique_id;
It just doesn't alert anyting, but:
$abc="123";
echo $abc;
this shows the alert box with value 123!
Why is it so? WHy I coudn't pass unique_id value like this?
MY ENTIRE PHP SCRIPT:
<?php
//Function to check if the request is an AJAX request
if (is_ajax()) {
if (isset($_POST["action"]) && !empty($_POST["action"])) { //Checks if action value exists
$action = $_POST["action"];
switch($action) { //Switch case for value of action
case "test": test_function(); break;
}
}
}
//Function to check if the request is an AJAX request
function is_ajax() {
return isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest';
}
function test_function(){
include($_SERVER['DOCUMENT_ROOT'].'/config.php');
$return = $_POST;
$return["json"] = json_encode($return);
//below code to store in database
$data = json_decode($return["json"], true);
/*....salting starts........*/
/*..........salting ends..............*/
echo $unique_id=uniqid();
$name=$data['name'];
$phone=$data['phone'];
$email=$data['email'];
$postcode=$data['postcode'];
$a=$data['sub'];
$b=$data['rate2'];
$subject_rate = array_intersect_key($b,$a);
/*...pdo.............................*/
$username="root";
$password="";
try {
//$pdo = new PDO('mysql:host=localhost;dbname=users', $username, $password);
//$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
include($_SERVER['DOCUMENT_ROOT'].'/config.php');
$stmt = $pdo->prepare('INSERT INTO authsessions (email,useruuid,salt,hashpword) VALUES(:email,:useruuid,:salt,:hash)');
$stmt->execute(array(
':email' => $email,
':useruuid'=>$unique_id,
':salt'=>$salt,
':hash'=>$hash
));
# Affected Rows?
$stmt->rowCount(); // 1
} catch(PDOException $e) {
'Error: ' . $e->getMessage();
}
//query2
try
{
$stmt2 = $pdo->prepare('INSERT INTO usrinfo (UUID,Name,Phone,Email,Postcode,DateReg,Reputation,ReviewPlus,ReviewNeg,Sex,Status,IsTuitionCentre) VALUES(:uuid,:name,:phone,:email,:poscode,now(),:reputation,:reviewplus,:reviewneg,:sex,:status,:permission)');
$stmt2->execute(array(
':uuid' => $unique_id,
':name'=>$name,
':phone'=>$phone,
':email'=>$email,
':poscode'=>$postcode,
':reputation'=>78,
':reviewplus'=>65,
':reviewneg'=>3,
':sex'=>$gender,
':status'=>0,
':permission'=>$permission
));
# Affected Rows?
$stmt2->rowCount(); // 1
} catch(PDOException $e) {
'Error: ' . $e->getMessage();
}
//query3
try
{
$stmt3 = $pdo->prepare('INSERT INTO tutoravailability (uuid,week_morning,week_afternoon,week_evening,weekend_morning,weekend_afternoon,weekend_evening) VALUES(:uuid,:week_morning,:week_afternoon,:week_evening,:weekend_morning,:weekend_afternoon,:weekend_evening)');
$stmt3->execute(array(
':uuid' => $unique_id,
':week_morning'=>$week_morning,
':week_afternoon'=>$week_afternoon,
':week_evening'=>$week_evening,
':weekend_morning'=>$weekend_morning,
':weekend_afternoon'=>$weekend_afternoon,
':weekend_evening'=>$weekend_evening
));
# Affected Rows?
$stmt3->rowCount(); // 1
} catch(PDOException $e) {
'Error: ' . $e->getMessage();
}
//query4
foreach($subject_rate as $v=>$k)
{
$key=$v;
$value=$k;
$post_unique_id= uniqid();
try
{
$stmt4 = $pdo->prepare('INSERT INTO posts (PostUUID,subid,date,pricing,post_status,UUID,Name,Phone,Email,Poscode,DateReg,Reputation,ReviewPlus,ReviewNeg,Sex,week_morning,week_afternoon,week_evening,weekend_morning,weekend_afternoon,weekend_evening,Status) VALUES(:PostUUID,:subid,now(),:pricing,:post_status,:UUID,:Name,:Phone,:Email,:Poscode,now(),:Reputation,:ReviewPlus,:ReviewNeg,:Sex,:week_morning,:week_afternoon,:week_evening,:weekend_morning,:weekend_afternoon,:weekend_evening,:Status)');
$stmt4->execute(array(
':PostUUID' => $post_unique_id,
':subid'=>$key,
':pricing'=>$value,
':post_status'=>1,
':UUID'=>$unique_id,
':Name'=>$name,
':Phone'=>$phone,
':Email' =>$email,
':Poscode'=>$postcode,
':Reputation'=>78,
':ReviewPlus'=>65,
':ReviewNeg'=>3,
':Sex'=>$gender,
':week_morning'=>$week_morning,
':week_afternoon'=>$week_afternoon,
':week_evening'=>$week_evening,
':weekend_morning'=>$weekend_morning,
':weekend_afternoon'=>$weekend_afternoon,
':weekend_evening'=>$weekend_evening,
':Status'=>0
));
# Affected Rows?
$stmt4->rowCount(); // 1
} catch(PDOException $e) {
'Error: ' . $e->getMessage();
}
}
/*try
{
$sql = "SELECT *FROM authsessions WHERE useruuid =:uid";
$statement = $pdo->prepare($sql);
$statement->bindValue(':uid', $unique_id);
$statement->execute();
$json = array();
while( $row = $statement->fetch()) {
array_push($json, array("id" => $row['useruuid']));}
header('Content-Type: application/json');
echo json_encode($json);
} catch(PDOException $e) {
echo 'Error: ' . $e->getMessage();
}*/
// $unique_id=uniqid();
}
?>

Answer 1

You need to use json_encode because the AJAX call says dataType: "json".
echo json_encode($unique_id);
It worked when you echoed 123 because a decimal number is valid JSON. But uniqid returns a hex string, and this isn't valid JSON. You need to encode it with quotes around it.