SyntaxError: Unexpected token < in JSON at position 0 php

Question

hey there i have an issue with my php coding i think, i am getting SyntaxError: Unexpected token < in JSON at position 0

during the success part of a jquery ajax form post. the php code is sending me back

<?



?>{"Status":"Login Success"}

the php code is as follows

<?php
    header('Content-type: application/json');
    //Load DB Connection
    require('Global.php');
    require('dbConnect.php');
    require('Studio7WebClass.php');


    //Get form data
    $username = $_POST['user'];
    $password = $_POST['pass'];
    $returnJSON = array('Status'=>'');
    $finalJSON = "";
    $Studio7Current = new Studio7Web;

    $Studio7Current->set_username($username);

        try{
            $statement = $conn->prepare("select * from Users where (Username = :name OR EmailAddress = :name)");
            $statement->execute(array(':name' => $username));
            $row = $statement->fetch();

            if (is_null($row)){
                $returnJSON['Status'] = "User Not Found";
                    $finalJSON = json_encode($returnJSON);
            }
            else{

                //Now check if the password matches the one the user entered.
                if($row['password'] == $password){
                    //Passwords match
                    $returnJSON['Status'] = "Login Success";
                    $finalJSON = json_encode($returnJSON);

                }else{

                    $returnJSON['Status'] = "Password Error";
                    $finalJSON =  json_encode($returnJSON);
                }

            }



        }catch(PDOException $e){
            $returnJSON['Status'] =  $e->getMessage();
            $finalJSON =  json_encode($returnJSON);
            file_put_contents('PDOErrors.txt', $e->getMessage(), FILE_APPEND);

        }       

    echo $finalJSON;

    ?>

i have no idea why im getting the response it gives. please help

If `` is sent back in the AJAX response, the error is obvious... — Nico Haase, May 14 '18 at 11:36
I don't think you should set the `header` -> just return the response in `JSON` format — treyBake, May 14 '18 at 11:47
turns out that Global.php require was an empty php file and it was putting that into the response... ive removed that require block and its sending valid json now :) — cmdevelopmentuk, May 14 '18 at 11:51

score 0 · Answer 1 · answered May 14 '18 at 11:52

0

Since this file uses <?php and not just <? as opening tags, the output comes from another file. You could either find that file and remove those 5 lines, or enable short tags (see How to enable PHP short tags?).

answered May 14 '18 at 11:52

Peter G

16
2

short tags are enabled by default with majority of PHP versions nowadays - this wasn't the issue :) – treyBake May 14 '18 at 12:19

SyntaxError: Unexpected token < in JSON at position 0 php

1 Answers1