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ðŸ“„ BooleanRule.php(738 B)
ðŸ“„ CalendarRule.php(1.95 KB)
ðŸ“„ CaptchaRule.php(2.1 KB)
ðŸ“„ ColorRule.php(2.05 KB)
ðŸ“„ CssIdentifierRule.php(2.85 KB)
ðŸ“„ EmailRule.php(6.36 KB)
ðŸ“„ EqualsRule.php(2.38 KB)
ðŸ“„ ExistsRule.php(2.16 KB)
ðŸ“„ FilePathRule.php(2.61 KB)
ðŸ“„ FolderPathExistsRule.php(2.28 KB)
ðŸ“„ ModuleLayoutRule.php(1.04 KB)
ðŸ“„ NotequalsRule.php(2.17 KB)
ðŸ“„ NumberRule.php(2.11 KB)
ðŸ“„ OptionsRule.php(2.8 KB)
ðŸ“„ PasswordRule.php(6.38 KB)
ðŸ“„ RulesRule.php(3.55 KB)
ðŸ“„ SubformRule.php(2.49 KB)
ðŸ“„ TelRule.php(3.13 KB)
ðŸ“„ TimeRule.php(5.04 KB)
ðŸ“„ UrlRule.php(4.38 KB)
ðŸ“„ UserIdRule.php(2.28 KB)
ðŸ“„ UsernameRule.php(2.22 KB)

Editing: OptionsRule.php

<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2011 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Form\Rule;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Form\Form;
use Joomla\CMS\Form\FormRule;
use Joomla\Registry\Registry;

/**
 * Form Rule class for the Joomla Platform.
 * Requires the value entered be one of the options in a field of type="list"
 *
 * @since  1.7.0
 */
class OptionsRule extends FormRule
{
	/**
	 * Method to test the value.
	 *
	 * @param   \SimpleXMLElement  $element  The SimpleXMLElement object representing the `<field>` tag for the form field object.
	 * @param   mixed              $value    The value to validate.
	 * @param   string             $group    The field name group control value. This acts as an array container for the field.
	 *                                       For example if the field has name="foo" and the group value is set to "bar" then the
	 *                                       full field name would end up being "bar[foo]".
	 * @param   Registry           $input    An optional Registry object with the entire data set to validate against the entire form.
	 * @param   Form               $form     The form object for which the field is being tested.
	 *
	 * @return  boolean  True if the value is valid, false otherwise.
	 *
	 * @since   1.7.0
	 */
	public function test(\SimpleXMLElement $element, $value, $group = null, Registry $input = null, Form $form = null)
	{
		// Check if the field is required.
		$required = ((string) $element['required'] === 'true' || (string) $element['required'] === 'required');

// Check if the value is empty.
		$blank = empty($value) && $value !== '0' && $value !== 0 && $value !== 0.0;

if (!$required && $blank)
		{
			return true;
		}

// Make an array of all available option values.
		$options = array();

// Create the field
		$field = null;

if ($form)
		{
			$field = $form->getField((string) $element->attributes()->name, $group);
		}

// When the field exists, the real options are fetched.
		// This is needed for fields which do have dynamic options like from a database.
		if ($field && \is_array($field->options))
		{
			foreach ($field->options as $opt)
			{
				$options[] = $opt->value;
			}
		}
		else
		{
			foreach ($element->option as $opt)
			{
				$options[] = $opt->attributes()->value;
			}
		}

// There may be multiple values in the form of an array (if the element is checkboxes, for example).
		if (\is_array($value))
		{
			// If all values are in the $options array, $diff will be empty and the options valid.
			$diff = array_diff($value, $options);

return empty($diff);
		}
		else
		{
			// In this case value must be a string
			return \in_array((string) $value, $options);
		}
	}
}

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Editing: OptionsRule.php

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