如何修复 PHP 7.2 警告：count()：参数必须是一个数组或实现 Countable in errors.php 的数组或 object？

Question

My script is-

<?php  if (count($errors) > 0) : ?>
  <div class="error">
        <?php foreach ($errors as $error) : ?>
          <p><?php echo $error ?></p>
        <?php endforeach ?>
  </div>
<?php  endif ?>

The error I get is Warning: count(): Parameter must be an array or an object that implements Countable .

I'm using PHP 7.2 on Apache2.

Answer 1

As the error says, Parameter must be an array or an object that implements Countable , the $errors should be an array.

In your case, it might be empty. So before using count() you should always check it implements a Countable interface.

I assume you are trying to iterate an Array and for that I first check the $errors is an array using is_array() .

<?php  if (is_array($errors) && count($errors) ) : ?>
  <div class="error">
        <?php foreach ($errors as $error) : ?>
          <p><?php echo $error ?></p>
        <?php endforeach ?>
  </div>
<?php  endif ?>

You may also need to look at is_countable() , link below:

PHP Official Documentation:

PHP count()

PHP is_countable()

PHP is_array()