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ðŸ“ ..
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: SubformRule.php

<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2019 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\Field\SubformField;
use Joomla\CMS\Form\Form;
use Joomla\CMS\Form\FormRule;
use Joomla\Registry\Registry;

/**
 * Form rule to validate subforms field-wise.
 *
 * @since  3.9.7
 */
class SubformRule extends FormRule
{
	/**
	 * Method to test given values for a subform..
	 *
	 * @param   \SimpleXMLElement  $element  The SimpleXMLElement object representing the `<field>` tag for the form field object.
	 * @param   mixed              $value    The form field value to validate.
	 * @param   string             $group    The field name group control value. This acts as 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   3.9.7
	 */
	public function test(\SimpleXMLElement $element, $value, $group = null, Registry $input = null, Form $form = null)
	{
		// Get the form field object.
		$field = $form->getField($element['name'], $group);

if (!($field instanceof SubformField))
		{
			throw new \UnexpectedValueException(sprintf('%s is no subform field.', $element['name']));
		}

if ($value === null)
		{
			return true;
		}

$subForm = $field->loadSubForm();

// Multiple values: Validate every row.
		if ($field->multiple)
		{
			foreach ($value as $row)
			{
				if ($subForm->validate($row) === false)
				{
					// Pass the first error that occurred on the subform validation.
					$errors = $subForm->getErrors();

if (!empty($errors[0]))
					{
						return $errors[0];
					}

return false;
				}
			}
		}
		// Single value.
		else
		{
			if ($subForm->validate($value) === false)
			{
				// Pass the first error that occurred on the subform validation.
				$errors = $subForm->getErrors();

if (!empty($errors[0]))
				{
					return $errors[0];
				}

return false;
			}
		}

return true;
	}
}

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Editing: SubformRule.php

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