如何将数据从React Native应用程序传递到PHP脚本？

Question

I'm using this code to pass the userName variable...

return fetch('http://creat1vedesign.com/userTabs4.php', {
  method: 'POST',
  headers: {
    Accept: 'application/json',
            'Content-Type': 'application/json',
  },
}, {
  body: JSON.stringify({
      userName: 'carolf'
  }),

...to this php script...

<?php
include 'DBConfig.php';
$con = new mysqli($HostName, $HostUser, $HostPass, $DatabaseName);
    $json = file_get_contents('php://input');
    $obj = json_decode($json,true);
    $userName = $obj['userName'];
$sql = "select * from Users where userName = '$userName'";
if ($result = mysqli_query($con,$sql)) { 
 while($row[] = $result->fetch_assoc()) {
    $tem = $row;
    $json = json_encode($tem);
 }
} else {
 echo "No Results Found.";
}
 echo $json;
$conn->close();
?>

...to retrieve data for a specific criteria. But either the React Native is not sending the data or the php script is not receiving it or the syntax is incorrect or I'm doing something else wrong :(

Any thoughts?

Answer 1

You can pass the parameters to the PHP script in the fetch URL by adding them after a '?' like this:

fetch("http://creat1vedesign.com/userTabs4.php?userName=carolf",{
        method:'POST',
        headers:{
          'Accept': 'application/json',
          'Content-Type': 'application/json',
        },
      })

      .then( (response) => {
            return response.json() })   
                .then( (json) => {
                    console.log(json)
                });

Just make sure to include a $_GET in your php script:

<?php

$userName= $_GET["userName"];

include 'DBConfig.php';
$con = new mysqli($HostName, $HostUser, $HostPass, $DatabaseName);
$json = file_get_contents('php://input');
$obj = json_decode($json,true);

$sql = "select * from Users where userName = '$userName'";
if ($result = mysqli_query($con,$sql)) { 
 while($row[] = $result->fetch_assoc()) {
    $tem = $row;
    $json = json_encode($tem);
 }
} else {
 echo "No Results Found.";
}
 echo $json;
$conn->close();
?>