验证电子邮件地址的有效性:
function validateEmail($email) {
return filter_var($email, FILTER_VALIDATE_EMAIL);
}
获取客户端IP地址:
function getClientIP() {
return $_SERVER['REMOTE_ADDR'];
}
生成随机字符串:
function generateRandomString($length = 10) {
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$randomString = '';
for ($i = 0; $i < $length; $i++) {
$randomString .= $characters[rand(0, strlen($characters) - 1)];
}
return $randomString;
}
获取当前日期和时间:
function getCurrentDateTime() {
return date('Y-m-d H:i:s');
}
判断字符串是否以指定的子字符串开头:
function startsWith($string, $startString) {
$length = strlen($startString);
return (substr($string, 0, $length) === $startString);
}
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