$output = preg_replace_callback(static::$regex['existelse'], function($matches){

 								$output = "<?php if(isset(\$data[".var_export($matches[1], true)."])): ?>";

 								$output .= static::compile($matches[2]);

 								$output .= static::compile($matches[3]);

 								$output .= "<?php endif; ?>";

 								return $output;

 								$output = "<?php if(isset(\$data[".var_export($matches[1], true)."])): ?>";

 								$output .= static::compile($matches[2]);

 								$output .= "<?php endif; ?>";

 							}, $output);

 						}

 					],