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<?php

class HTMLPurifier_ChildDef_HTML5_Picture extends HTMLPurifier_ChildDef
{
    public $type = 'picture';

public $elements = array(
        'img'    => true,
        'source' => true,
    );

/**
     * @param HTMLPurifier_Node[] $children
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return array|bool
     */
    public function validateChildren($children, $config, $context)
    {
        // if there are no tokens, delete parent node
        if (empty($children)) {
            return false;
        }

if (!isset($config->getHTMLDefinition()->info['img'])) {
            trigger_error("Cannot allow picture without allowing img", E_USER_WARNING);
            return false;
        }

$hasImg = false;
        $result = array();

// Content model:
        // Zero or more source elements, followed by one img element, optionally intermixed with script-supporting elements.
        // https://html.spec.whatwg.org/multipage/embedded-content.html#the-picture-element
        foreach ($children as $node) {
            if ($node->name === 'source' || $node->name === 'img') {
                $result[] = $node;
            }
            if ($node->name === 'img') {
                $hasImg = true;
                break;
            }
        }

if (!$hasImg || empty($result)) {
            return false;
        }

return $result;
    }
}