vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Required.php

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<?php

/**
 * Definition that allows a set of elements, but disallows empty children.
 */
class HTMLPurifier_ChildDef_Required extends HTMLPurifier_ChildDef
{
    /**
     * Lookup table of allowed elements.
     * @type array
     */
    public $elements = array();

    /**
     * Whether or not the last passed node was all whitespace.
     * @type bool
     */
    protected $whitespace = false;

    /**
     * @param array|string $elements List of allowed element names (lowercase).
     */
    public function __construct($elements)
    {
        if (is_string($elements)) {
            $elements = str_replace(' ', '', $elements);
            $elements = explode('|', $elements);
        }
        $keys = array_keys($elements);
        if ($keys == array_keys($keys)) {
            $elements = array_flip($elements);
            foreach ($elements as $i => $x) {
                $elements[$i] = true;
                if (empty($i)) {
                    unset($elements[$i]);
                } // remove blank
            }
        }
        $this->elements = $elements;
    }

    /**
     * @type bool
     */
    public $allow_empty = false;

    /**
     * @type string
     */
    public $type = 'required';

    /**
     * @param array $children
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return array
     */
    public function validateChildren($children, $config, $context)
    {
        // Flag for subclasses