How to get data from MySQL with PHP - php

Question

Hello all I am tryin to build IOS app and I need to get data my MySQL database. I do not know php. I found a tutorial https://codewithchris.com/iphone-app-connect-to-mysql-database/
In section 3 where we create PHP service I copy it and edit for mine information. PHP code is like that
<?php
//create connection
$con=mysqli_connect("localhost","myuserid","mypassword","i4142489_wp1");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// This SQL statement selects ALL from the table 'Locations'
$sql = "SELECT * FROM treelibrary";
// Check if there are results
if ($result = mysqli_query($con, $sql))
{
// If so, then create a results array and a temporary one
// to hold the data
$resultArray = array();
$tempArray = array();
// Loop through each row in the result set
while($row = $result->fetch_object())
{
// Add each row into our results array
$tempArray = $row;
array_push($resultArray, $tempArray);
}
// Finally, encode the array to JSON and output the results
echo json_encode($resultArray);
}
// Close connections
mysqli_close($con);
?>
I load it the my server and nothings pops up just the blank page... Is there any reason or where is my mistake. Thanks for helps.
Have a nice day.

Answer 1

I didn't read you're whole code, but I'm pretty sure you're trying to put the results into a JSON format and echo them.
Here's an easy way to do so;
<?php
//
// EDIT: dont use this code, scroll a little bit lower to see the edit I made.
//
//create connection
$con=mysqli_connect("localhost","myuserid","mypassword","i4142489_wp1");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// This SQL statement selects ALL from the table 'Locations'
$sql = "SELECT * FROM treelibrary";
// Executes the SQL statement and puts results into $res
$res = $con->query($sql);
// Checks if there's any rows
if($res->num_rows > 0) {
// Puts all results in $row
$row = $res->fetch_assoc();
// echo & encode datas
echo json_encode($row);
} else {
echo "no data found";
}
// Close connections
mysqli_close($con);
Edit: The code above does work but only echoes the first row.
Here's one that actually echoes all of the rows in JSON format (tested).
<?php
//create connection
$con=mysqli_connect("localhost","myuserid","mypassword","i4142489_wp1");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// This SQL statement selects ALL from the table 'Locations'
$sql = "SELECT * FROM treelibrary";
// Executes the SQL statement and puts results into $res
$res = $con->query($sql);
// Checks if there's any rows
if($res->num_rows > 0) {
// defines $data
$data = array();
// grabs all data and adds them to the $data array
while ($row = $res->fetch_assoc()) {
array_push($data, $row);
}
// echo & encode datas
echo json_encode($data);
} else {
echo "no data found";
}
// Close connections
mysqli_close($con);