wp.blocks.registerBlockType( 'example/hello-world', {
	title: 'Hello World',
	icon: 'universal-access-alt',
	category: 'layout',
	attributes: {},
	edit: function(){
		return wp.element.createElement( wp.editor.InnerBlocks );
	},
	save: function(){
		return null;
	},
});

// This function is wrong and needs documentation.
function php_render_block( $attributes, $content = '' ) {
	// #1 How do I access InnerBlocks.Content here?
	// #2 When accessed how do I typically parse all InnerBlocks.Content?
	return '<p>' . $attributes['foo'] . '</p>' . '<pre><code>' . htmlspecialchars( $content ) . '</code></pre>';
}