My php code won’t show back result form phpmyadmin (sql) database

So i recently set up a local web server on Raspberry Pi and I am currently experiencing little bit of trouble. I wrote a code (for test reasons) that after you click on one button in .html it runs test.php document that creates a table in sql, fills in the data and than prints the output.

<?php
$conn= mysqli_connect('localhost','admin','admin','database_test');
$createTable='CREATE TABLE Bank_statements(
id INT(3) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
firstName VARCHAR(15) NOT NULL,
lastName VARCHAR(15) NOT NULL
);';
$addData='INSERT INTO Bank_statements(firstName,lastName) VALUES ("peter","zupanc");';
$query='SELECT * FROM Bank_statements;';
$result=mysqli_query($conn,$query);
if (isset($_POST['submit'])){
    if (mysqli_query($conn,$createTable)){
            echo 'sucess creating a table';
            if (mysqli_query($conn,$addData)){
                    echo 'sucess adding data <br>';
                    while ($row=mysqli_fetch_array($result)){
                        echo $row['id'].$row['firstName'].$row['lastName']."<br>";
                    }
            }else{
                    echo 'error adding data<br>'.mysqli_error($conn);
            }
    }else{
            echo 'failed at creating table:<br>'.mysqli_error($conn);
    }
}
mysqli_close($conn);
?>

Everything goes as planed till part when php should return/echo $row but it doesn’t its just empty space.

Answer

I believe your issue is that you executed $result=mysqli_query($conn,$query); before the table was created in the DB. The query is executed when you call it. The mysqli_fetch_array just “transforms” a previous result row to an array format.

Try executing mysqli_query($conn,$query) right before the while.

I suggest also you define value for the mysqli_fetch_array second argument $resulttype (optional).

See docs for reference: https://www.php.net/manual/en/mysqli-result.fetch-array.php

Default value (MYSQLI_BOTH) is usually an overkill and apparently you just want the result format that comes from using MYSQLI_ASSOC.