php mysql example

Example 1: query sql in php

$sql = "SELECT id, firstname, lastname FROM MyGuests";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>";
    }
} else {
    echo "0 results";
}
$conn->close();

Example 2: php mysql

In order to send data to a databse securely use prepared statements otherwise 
you can get attacked by an SQL Injection easily.
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https://www.w3schools.com/php/php_mysql_prepared_statements.asp