php 创建mysql用户

<?php
$servername = "localhost";
$username = "admin";
$password = "admin_password";

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

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

// 创建新用户
$new_username = "new_user";
$new_password = "new_user_password";
$sql = "CREATE USER '$new_username'@'localhost' IDENTIFIED BY '$new_password'";

if ($conn->query($sql) === TRUE) {
    echo "新用户创建成功";
} else {
    echo "创建用户时出错: " . $conn->error;
}

// 关闭连接
$conn->close();
?>

// 检查用户是否存在
$sql_check = "SELECT User FROM mysql.user WHERE User = '$new_username'";
$result = $conn->query($sql_check);

if ($result->num_rows > 0) {
    echo "用户名已存在";
} else {
    // 创建新用户
    $sql_create = "CREATE USER '$new_username'@'localhost' IDENTIFIED BY '$new_password'";
    if ($conn->query($sql_create) === TRUE) {
        echo "新用户创建成功";
    } else {
        echo "创建用户时出错: " . $conn->error;
    }
}