是否有可能使用PHP来备份没有依赖的SQL？如果没有,哪个最好？

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $conn->exec("INSERT INTO myTable (column1, column2) VALUES ('value1', 'value2')");
    echo "New record created successfully";
} catch(PDOException $e) {
    echo "Error: " . $e->getMessage();
}

$conn = null;
?>

mysqldump -u username -p password databasename > backup.sql