php - Getting error message before entering text in textbox

Question

In below code I am getting error message Sorry your name is not in correct format even before I enter any text. Can anyone tell me what mistake am I making ?

if ((isset($_POST['name'])) and(isset($_POST['email'])) and (filter_var($email, FILTER_VALIDATE_EMAIL)) and (preg_match('/^[A-Za-z0-9\s]+$/', $name))) {

    //if yes, it is writing it into file
    $myfile = fopen("names.txt", "w") or die("Unable to open file!");
    $txt = $name . "\r\n" . $email;
    fwrite($myfile, $txt);

    fclose($myfile);
}
else {
    echo "Sorry, your name is not in correct format.";
}

Answer 1

您必须在两个if语句中分隔您的条件。第一个检查是否发布了某些内容。第二个检查输入是否有效。该else语句应位于第二个之下if（如果输入无效）。

if (isset($_POST['name']) && isset($_POST['email'])) 
{
    $name = $_POST['name']; // get data from $_POST
    $email = $_POST['email']; // get data from $_POST
    if (filter_var($email, FILTER_VALIDATE_EMAIL) && preg_match('/^[A-Za-z0-9\s]+$/', $name))
    {
        //if yes, it is writing it into file
        $myfile = fopen("names.txt", "w") or die("Unable to open file!");
        $txt = $name . "\r\n" . $email;
        fwrite($myfile, $txt);
        fclose($myfile);
    }
    else {
        echo "Sorry, your name or email are not in correct format.";
    }
}