+
+ return preg_replace_callback(
+ '< \[\[ ([^]]*) \]\] >x',
+ function ($sub) use ($blocks) {
+ list ($placeholder, $name) = $sub;
+ if (isset($blocks[$name])) {
+ $html = $blocks[$name];
+ }
+ else {
+ $html = '<strong class="warn"><em>'.$name.'</em> ontbreekt</strong>';
+ }
+ return sprintf('<!--BLOCK:%s-->%s<!--/-->',
+ is_numeric($name) ? '' : $placeholder, # edit replacement
+ preg_replace('{<!--[^-]*-->}', '', $html) # contents
+ );
+ },
+ $doc
+ );