(PHP 5, PHP 7)
DOMDocument::schemaValidateSource — Validates a document based on a schema
public DOMDocument::schemaValidateSource ( string $source [, int $flags ] ) : bool
Validates a document based on a schema defined in the given string.
source
A string containing the schema.
flags
A bitmask of Libxml schema validation flags. Currently the only supported value is LIBXML_SCHEMA_CREATE. Available since PHP 5.5.2 and Libxml 2.6.14.
 Returns true on success or false on failure. 
| Version | Description | 
|---|---|
| 5.5.2 |  Added the flags parameter  |  
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    https://www.php.net/manual/en/domdocument.schemavalidatesource.php