(PHP >= 5.4.0) Set security preferences public

(PHP 5 >= 5.1.2, PHP 7, PECL xmlwriter >= 1.0.0) Create start comment

(^) Executes a given SQL query against a relational database and returns the results as a normalised data graph

(PHP 5 >= 5.0.1, PHP 7) Creates a new SimpleXMLElement object

(PECL xmldiff >= 0.8.0) Diff two XML documents

(PHP 5 >= 5.1.2, PHP 7, PECL xmlwriter >= 1.0.0) Flush current buffer

(^) Get a string describing the SDO_DataObject.

(PHP 5 >= 5.4.0, PHP 7) Changes the default external entity loader

(PHP 5, PHP 7) Transform to a DOMDocument DOMDocument

(PHP 5 >= 5.1.2, PHP 7, PECL xmlwriter >= 0.1.0) Create start PI tag