php随机用户名

<?php
function generateRandomUsername($length = 8) {
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $charactersLength = strlen($characters);
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, $charactersLength - 1)];
    }
    return $randomString;
}

$username = generateRandomUsername();
echo "Generated Username: " . $username;
?>

<?php
function generateUniqueUsername($length = 8) {
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $charactersLength = strlen($characters);
    do {
        $randomString = '';
        for ($i = 0; $i < $length; $i++) {
            $randomString .= $characters[rand(0, $charactersLength - 1)];
        }
    } while (checkUsernameExists($randomString));
    return $randomString;
}

function checkUsernameExists($username) {
    // 这里应该是查询数据库的代码
    // 返回true如果用户名已存在，否则返回false
    return false; // 示例中假设用户名不存在
}

$username = generateUniqueUsername();
echo "Generated Unique Username: " . $username;
?>

<?php
function generateCustomUsername($length = 8, $customChars = 'abcdefghijklmnopqrstuvwxyz') {
    $charactersLength = strlen($customChars);
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $customChars[rand(0, $charactersLength - 1)];
    }
    return $randomString;
}

$username = generateCustomUsername();
echo "Generated Custom Username: " . $username;
?>