Validate document against XSD

# XMLReader::setSchema

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

XMLReader::setSchema — Validate document against XSD

### Description

public XMLReader::setSchema(?string `$filename`): bool

Use W3C XSD schema to validate the document as it is processed. Activation is only possible before the first Read().

### Parameters

`filename`

  The filename of the XSD schema.

### Return Values

Returns `true` on success or `false` on failure.

### Errors/Exceptions

Issues `E_WARNING` if libxml was built without schema support, the schema contains errors or if XMLReader::read() has already been called.

### Notes

Caution

This function is only available when PHP is compiled against libxml 20620 or later.

### See Also

- XMLReader::setRelaxNGSchema() - Set the filename or URI for a RelaxNG Schema
- XMLReader::setRelaxNGSchemaSource() - Set the data containing a RelaxNG Schema
- XMLReader::isValid() - Indicates if the parsed document is valid

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