<?php function libxml_options_to_int($libxmlOptions) { $defined_constants = get_defined_constants(true); $env_array = explode('|', $libxmlOptions); $libxml_constants = array_intersect_key($defined_constants['libxml'], array_flip($env_array)); $sum = 0; foreach($libxml_constants as $value) { $sum = $sum|$value; } return $sum; } ?>