How do I fix the error on my password confirmation field

Question

I'm having an issue with my PHP code where my password confirmation field keeps asking me to confirm my password even thought I did add it and matches.

Here is my code:

            if(empty($data['password'])){
                $data['pass_err'] = 'Pleae enter password';
              } elseif(strlen($data['password']) < 6){
                $data['pass_err'] = 'Password must be at least 6 characters.';
              }

            // Validate confirm password 
            if(empty($data['confirm_password'])){
                $data['confirm_pass_err'] = 'Pleae confirm password';
            } else {
                    if ($data['password'] !== $data['confirm_password']){
                        $data['confirm_pass_err'] = 'Passwords do not match.';
                    }
                }

My form:

<form action="<?php echo LINKROOT; ?>/users/register" method="post">
                <div class="form-group">
                    <input type="text" name="name" class="form-control form-control-md <?php echo (!empty($data['name_err'])) ? 'is-invalid' : '' ?>" value="<?php echo $data['name']; ?>" placeholder="Your Name">
                    <span class="invalid-feedback"><?php echo $data['name_err']; ?></span>
                </div>
                <br>
                <div class="form-group">
                    <input type="email" name="email" class="form-control form-control-md <?php echo (!empty($data['email_err'])) ? 'is-invalid' : '' ?>" value="<?php echo $data['email']; ?>" placeholder="Your Email Address">
                    <span class="invalid-feedback"><?php echo $data['email_err']; ?></span>
                </div>
                <br>
                <div class="form-group">
                    <input type="password" name="password" class="form-control form-control-md <?php echo (!empty($data['pass_err'])) ? 'is-invalid' : '' ?>" value="<?php echo $data['password']; ?>" placeholder="Your Password">
                    <span class="invalid-feedback"><?php echo $data['pass_err']; ?></span>
                </div>
                <br>
                <div class="form-group">
                    <input type="password" name="confirm_password" class="form-control form-control-md <?php echo (!empty($data['confirm_pass_err'])) ? 'is-invalid' : '' ?>" value="<?php echo $data['confirm_password']; ?>" placeholder="Confirm Your Password">
                    <span class="invalid-feedback"><?php echo $data['confirm_pass_err']; ?></span>
                </div>
                <br>
                <div class="form-group">
                    <div class="row text-center">
                        <div class="col">
                            <input type="submit" style="width:100%" value="Sign Up" class="btn btn-success btn-block">
                        </div>
                        <div class="col">
                            <a href="<?php echo LINKROOT; ?>/users/login" style="width:100%" class="link-secondary">Have an account? Sign In</a>
                        </div>
                    </div>
                </div>
                </div>
            </form>

I've also attached a screenshot for reference

Answer 1

1. ensure that $data['confirm_password'] is not emptified by the code after posting.
2. try code below.

    // Validate password and confirm_password
    if (isset($data['password']) && isset($data['confirm_password']) && is_string($data['password']) && is_string($data['confirm_password'])) {
        $len_p = strlen($data['password']);
        $len_cp = strlen($data['confirm_password']);
        // valid case
        if ($len_p >= 6 && $data['password'] === $data['confirm_password']) {
            // save user
        }
        // invalid case
        else {
            if (0 === $len_p) {
                // password is empty
                // ..
                return;
            }
            if (6 > $len_p) {
                // password is short
                // ..
                return;
            }
            if ($data['password'] !== $data['confirm_password']) {
                // passwords don't match
                // ..
                return;
            }
        }
    }
    else {
        // $data is improper
    }