How can PHP beginners effectively pass multiple variables through checkboxes in a form?

When passing multiple variables through checkboxes in a form, you can use an array in the name attribute of the checkboxes. This way, when the form is submitted, PHP will receive an array of values corresponding to the checked checkboxes. You can then process this array in your PHP code to handle the selected variables accordingly. 

<form method="post" action="process.php">
  <input type="checkbox" name="colors[]" value="red"> Red
  <input type="checkbox" name="colors[]" value="blue"> Blue
  <input type="checkbox" name="colors[]" value="green"> Green
  <input type="submit" value="Submit">
</form>
```

In the process.php file, you can access the selected colors using the $_POST superglobal as an array:

```php
<?php
if(isset($_POST['colors'])) {
  $selectedColors = $_POST['colors'];
  
  foreach($selectedColors as $color) {
    echo $color . "<br>";
  }
}
?>

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