i have two variables mobile and email now i want to validate both but i want the user to leave blank one of the fields if user does not have one for ex if a user does not want to register with his email then he can go to mobile number for registration and vice versa this is my validation code
<?php
$emailError = "";
$fullnameError = "";
$usernameError = "";
$passwordError = "";
$mobileerror = "";
$errors = 0;
if ((isset($_POST['submit']))) {
$email = strip_tags($_POST['email']);
$fullname = strip_tags($_POST['fullname']);
$username = strip_tags($_POST['username']);
$password = strip_tags($_POST['password']);
$mobile = strip_tags($_POST['mobile']);
$fullname_valid = $email_valid = $mobile_valid = $username_valid = $password_valid = false;
if (!empty($fullname)) {
if (strlen($fullname) > 2 && strlen($fullname) <= 30) {
if (!preg_match('/[^a-zA-Zs]/', $fullname)) {
$fullname_valid = true;
# code...
} else {
$fullnameError = "fullname can contain only alphabets <br>";
$errors++;
}
} else {
$fullnameError = "fullname must be 2 to 30 char long <br>";
$errors++;
}
} else {
$fullnameError = "fullname can not be blank <br>";
$errors++;
}
if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
$query2 = "SELECT email FROM users WHERE email = '$email'";
$fire2 = mysqli_query($con, $query2) or die("can not fire query" . mysqli_error($con));
if (mysqli_num_rows($fire2) > 0) {
$emailError = $email . "is already taken please try another one<br> ";
} else {
$email_valid = true;
}
# code...
} else {
$emailError = $email . "is an invalid email address <br> ";
$errors++;
}
# code...
if ($mobile) {
$query4 = "SELECT mobile FROM users WHERE mobile = '$mobile'";
$fire4 = mysqli_query($con, $query4) or die("can not fire query" . mysqli_error($con));
if (mysqli_num_rows($fire4) > 0) {
$mobileerror = "is already taken please try another one<br> ";
} else {
$mobile_valid = true;
}
}
if (!empty($username)) {
if (strlen($username) > 4 && strlen($username) <= 15) {
if (!preg_match('/[^a-zA-Zd_.]/', $username)) {
$query = "SELECT username FROM users WHERE username = '$username'";
$fire = mysqli_query($con, $query) or die("can not fire query" . mysqli_error($con));
if (mysqli_num_rows($fire) > 0) {
$usernameError = '<p style="color:#cc0000;">username already taken</p>';
$errors++;
} else {
$username_valid = true;
}
} else {
$usernameError = "username can contain only alphabets <br>";
$errors++;
}
} else {
$usernameError = "username must be 4 to 15 char long <br>";
$errors++;
}
} else {
$usernameError = "username can not be blank <br>";
$errors++;
}
if (!empty($password)) {
if (strlen($password) >= 5 && strlen($password) <= 15) {
$password_valid = true;
$password = md5($password);
# code...
} else {
$passwordError = $password . "password must be between 5 to 15 character long<br>";
$errors++;
}
# code...
} else {
$passwordError = "password can not be blank <br>";
$errors++;
}
//if there's no errors insert into database
if ($errors <= 0) {
if ($fullname_valid && ($email_valid || $mobile_valid )&& $password_valid && $username_valid) {
$query = "INSERT INTO users(fullname,email,username,password,avatar_path) VALUES('$fullname','$email','$username','$password','avatar.jpg')";
$fire = mysqli_query($con, $query) or die("can not insert data into database" . mysqli_error($con));
if ($fire) {
header("Location: dashboard.php");
}
}
}
}
?>
now when i use email and leave blank mobile the code works fine but when i use email and leave blank mobile then error occurs how to solve this problem
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