view_2.php

<?php

#----------------------------------------------------
#	V I E W S
#----------------------------------------------------

/**
 * Render a phtml file
 * 
 * @param $_path string the phtml path
 * @param $_vars mixed the view vars
 * @return string the rendered content
 */
function phtml($_path, $_vars = []) {
	ob_start();
	$_layout = false;
	extract($_vars);
	include($_path);
	$_content = ob_get_clean();
	if ($_layout) {
		return render($_layout, $_vars);
	}
	return $_content;
}

/**
 * Render template
 *
 * @param $path string the phtml path
 * @param $vars mixed the view vars
 * @return string the rendered content
 */
function render($path, $vars = []) {
	$view_path = option('view_path') . $path . '.phtml';
	$temp_path = option('temp_path') . 'view_' . md5($path) . '.phtml';
	$vars += $GLOBALS[_VERSION]['views'];

	if (
		 ! file_exists($temp_path)
		|| filemtime($temp_path) < filemtime($view_path)
	) {
		$content = file_get_contents($view_path);

		// parse the view
		$content = str_replace(
			[
				'{{',
				'}}',
				'{else}',
				'{/block}'
			],
			[
				'<?=',
				'?>',
				'<?php else: ?>',
				'<?php }); ?>'
			],
			$content
		);
		$content = preg_replace(
			[
				'#\{layout +(.*?)\}#',
				'#\{ *\$([a-zA-Z\_][a-zA-Z0-9\_]*) += +(.*?)}#',
				'#\{block +(.*?)}#',
				"#\{yield +(.*?)}#",
				'#\{/(if|foreach|for|while)\}#',
				'#\{(if|elseif|foreach|for|while) +(.*?)\}#'
			],
			[
				"<?php \$_layout = '$1'; ?>",
				"<?php set('$1', \$$1 = $2); ?>",
				"<?php block('$1', function(\$_vars) { extract(\$_vars); ?>",
				"<?= block_yield('$1', \$_vars) ?>",
				"<?php end$1; ?>",
				"<?php $1($2): ?>"
			],
			$content
		);

		file_put_contents($temp_path, $content);
	}

	return phtml($temp_path, $vars);
}

/**
 * Set a view value 
 *
 * @param $name string the view key's name
 * @param $value mixed the view key's value
 */
function set($name, $value) {
	$GLOBALS[_VERSION]['views'][$name] = $value;
}

/**
 * Assign view values
 *
 * @param array the vars
 */
function assign(array $vars) {
	$GLOBALS[_VERSION]['views'] = $vars + $GLOBALS[_VERSION]['views'];
}

/**
 * Record block
 *
 * @param $name string the block name
 * @param $block void(array $_vars) the block body
 */
function block($name, $block) {
	set("_block_$name", $block);
}

/**
 * Yield a block
 *
 * @param $name string the block name
 * @return string the block rendered content
 */
function block_yield($name, $vars = []) {
	if (array_key_exists($name = "_block_$name", $GLOBALS[_VERSION]['views'])) {
		return call_user_func(
			$GLOBALS[_VERSION]['views'][$name],
			$vars + $GLOBALS[_VERSION]['views']
		);
	}
	return '';
}