html - PHP registration form: Make the inputs with red borders if there is an error -

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i'm making registration form php , i'd something: if user has not completed form correctly, want, in addition error message, make inputs (where there error) red borders.

my registration form (html part):

<?php if(!empty($errors)): ?>  <div class="flash-message error">     <h3>you have not completed form correctly. error(s) come(s) following thing(s):</h3>     <ol>         <?php foreach($errors $error): ?>         <li>             <p><?= $error; ?></p>         </li>         <?php endforeach; ?>     </ol> </div>  <?php endif; ?>  <h1 class="page-heading"><?php echo $title; ?></h1>  <form action="" method="post">     <ul>         <li>             <label for="nickname">nickname:</label> <input id="nickname" name="nickname" type="text">             <p class="input-description">your nickname identity on site; displayed wherever post, etc.</p>         </li>         <li>             <label for="email">email:</label> <input id="email" name="email" type="text" placeholder="your@email.com">             <p class="input-description">enter valid email receive confirmation link validate account.</p>         </li>         <li>             <label for="password">password:</label> <input id="password" name="password" type="password">             <p class="input-description">enter password sign in account. try put difficult password make more complicated find.</p>         </li>         <li>             <label for="password-confirmation">password confirmation:</label> <input id="password-confirmation" name="password-confirmation" type="password">             <p class="input-description">confirm password have put in field above.</p>         </li>     </ul>     <button type="submit" class="button primary">sign up</button> </form>

current result: http://prntscr.com/86h5r2

php code:

<?php  if(!empty($_post)) {      /* nickname */      if(empty($_post["nickname"]))     {         $errors["nickname"] = "you have not completed nickname field.";     }      elseif(!preg_match("/^[a-za-z0-9 _]+$/", $_post["nickname"]))     {         $errors["nickname"] = "your nickname not valid.";     }      /* e-mail */      if(empty($_post["email"]))     {         $errors["email"] = "you have not completed email field.";     }      elseif(!filter_var($_post["email"], filter_validate_email))     {         $errors["email"] = "your email not valid.";     }      /* password */      if(empty($_post["password"]))     {         $errors["password"] = "you have not completed 2 password fields.";     }      elseif($_post["password"] != $_post["password-confirmation"])     {         $errors["password"] = "the passwords did not match. please enter same password in both fields.";     } }  ?>

to add border input error want embed php if statement in class attributes. define classname in css

<input type="text" class="<?=  isset($error['name']) ? 'has-error'  : ''   ?>" value="" >

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