当我尝试发送邮件时。。。它显示-

致命错误：在/home/junkie/public\\u html/sub\\u demo/wp content/themes/scroller/includes/contact form中调用未定义的函数get\\u option（）。php第9行

我的代码=>联系方式。php

<?php
if($_POST)
{
    //check if its an ajax request, exit if not
    if(!isset($_SERVER[\'HTTP_X_REQUESTED_WITH\']) AND strtolower($_SERVER[\'HTTP_X_REQUESTED_WITH\']) != \'xmlhttprequest\') {
        die();
    } 

    $to_Email       = "[email protected]"; //Replace with recipient email address
    $subject        = \'Ah!! My email from Somebody out there...\'; //Subject line for emails

    //check $_POST vars are set, exit if any missing
    if(!isset($_POST["userName"]) || !isset($_POST["userEmail"]) || !isset($_POST["userPhone"]) || !isset($_POST["userMessage"]))
    {
        die();
    }

    //Sanitize input data using PHP filter_var().
    $user_Name        = filter_var($_POST["userName"], FILTER_SANITIZE_STRING);
    $user_Email       = filter_var($_POST["userEmail"], FILTER_SANITIZE_EMAIL);
    $user_Phone       = filter_var($_POST["userPhone"], FILTER_SANITIZE_STRING);
    $user_Message     = filter_var($_POST["userMessage"], FILTER_SANITIZE_STRING);

    //additional php validation
    if(strlen($user_Name)<4) // If length is less than 4 it will throw an HTTP error.
    {
        header(\'HTTP/1.1 500 Name is too short or empty!\');
        exit();
    }
    if(!filter_var($user_Email, FILTER_VALIDATE_EMAIL)) //email validation
    {
        header(\'HTTP/1.1 500 Please enter a valid email!\');
        exit();
    }
    if(!is_numeric($user_Phone)) //check entered data is numbers
    {
        header(\'HTTP/1.1 500 Only numbers allowed in phone field\');
        exit();
    }
    if(strlen($user_Message)<5) //check emtpy message
    {
        header(\'HTTP/1.1 500 Too short message! Please enter something.\');
        exit();
    }

    //proceed with PHP email.
    $headers = \'From: \'.$user_Email.\'\' . "rn" .
    \'Reply-To: \'.$user_Email.\'\' . "rn" .
    \'X-Mailer: PHP/\' . phpversion();

    @$sentMail = mail($to_Email, $subject, $user_Message .\'  -\'.$user_Name, $headers);

    if(!$sentMail)
    {
        header(\'HTTP/1.1 500 Could not send mail! Sorry..\');
        exit();
    }else{
        echo \'Hi \'.$user_Name .\', Thank you for your email! \';
        echo \'Your email has already arrived in my Inbox, all I need to do is Check it.\';
    }
}
?>