PHP- Form Validation Errors - php

Question

This is my first time validating, I am having the hardest time have spent endless hours on this already. I have a registration form that needs to be validated, i have tried 2 scripts for this. The script that works best can be seen below: however every time I try to echo the error message to display under my text field i receive the following error messages:
Notice: Undefined variable: c_email in /Applications/MAMP/htdocs/PhpProject2/Reg_1.php on line 161
Notice: Undefined variable: c_emailErr in /Applications/MAMP/htdocs/PhpProject2/Reg_1.php on line 163
Notice: Undefined variable: c_pass1Err in /Applications/MAMP/htdocs/PhpProject2/Reg_1.php on line 169
C_emailErr and c_pass1Err are both defined.
any help would be appreciated.
HTML
<section class="container">
<form id="myform " class="Form" method="POST" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" accept-charset="utf-8">
<!--<div id="first">-->
<input type="email" id="email" name="email" placeholder="Email Address" value="<?= $c_email ?>" required >
<br>
<span class="error"><?php echo $c_emailErr; ?></span>
<br>
<figure>
<input class ="login-field" type="password" id="pass1" name="pass1" value="<?= $c_pass1 ?>" placeholder="Password" maxlength="30" required>
<br>
<span class="error"><?php echo $c_pass1Err; ?></span>
<br>
<input class ="login-field" type="password" id="pass2" name="pass2" value="" placeholder=" Confirm password" maxlength="30" required><!--<span class="error"><?php //echo $c_pass2Err; ?></span>-->
<div id="messages"></div>
</figure>
<p class="remember_me">
</p>
<input type="submit" name="submit" value="Register" id="submit_button" class="btn btn-default">
<br>
</form>
<?php
?>
</form>
</section>
PHP
<?php
if (isset($_POST['submit'])) {
$c_email = $_POST['email'];
$c_pass1 = $_POST['pass1'];
$c_pass2 = $_POST['pass2'];
$c_emailErr = $c_pass1Err = $c_pass2Err = "";
//Checking the email address
if (!filter_var($c_email, FILTER_VALIDATE_EMAIL) === false) {
echo ("<b id='email'> This is a valid email address </b>");
} else {
echo ("<b id='email'> Email is not a valid email address</b>");
}
if (strlen($c_pass1) <= '8') {
echo "<b>Your Password Must Contain At Least 8 Characters!</br>";
//check passwords
} elseif ($c_pass1 == $c_pass2) {
$q = "INSERT INTO Cus_Register(Cus_Email,Cus_Password,Cus_confirm_password) VALUES (?,?,?)";
$stmt = mysqli_prepare($dbc, $q);
//new
// $stmt = mysqli_prepare($dbc, $insert_c);
//debugging
//$stmt = mysqli_prepare($dbc, $insert_c) or die(mysqli_error($dbc));
mysqli_stmt_bind_param($stmt, 'sss', $c_email, $c_pass1, $c_pass2);
if ($q) {
echo "<script> alert('registration sucessful')</script>";
}
} else {
echo "<b>Oops! Your passwords do not </b>";
}
}
?>

Answer 1

You are defining those variables, but you are defining them inside of an if block.. Move them outside of the if block.
<?php
$c_emailErr = $c_pass1Err = $c_pass2Err = "";
if (isset($_POST['submit'])) {
$c_email = $_POST['email'];
$c_pass1 = $_POST['pass1'];
$c_pass2 = $_POST['pass2'];