php mysql修改密码

mysql -u root -p

ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';
FLUSH PRIVILEGES;
EXIT;

<?php
$servername = "localhost";
$username = "root";
$password = "old_password";
$dbname = "database_name";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 修改密码
$new_password = "new_password";
$sql = "ALTER USER 'root'@'localhost' IDENTIFIED BY '$new_password'";
if ($conn->query($sql) === TRUE) {
    echo "密码修改成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();
?>

GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION;
FLUSH PRIVILEGES;