What is the significance of naming checkboxes with square brackets in PHP?

Naming checkboxes with square brackets in PHP allows multiple checkboxes with the same name to be submitted as an array. This is useful when dealing with groups of checkboxes where the user can select multiple options. By naming the checkboxes with square brackets, PHP will automatically create an array with all the selected values. 

<form method="post">
  <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 PHP code handling the form submission, you can access the selected checkboxes as an array like this:

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

Keywords

PHP checkboxes square brackets naming convention array form handling

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