PHP XML Parser Functions
PHP XML Parser Introduction
The XML functions lets you parse, but not validate, XML documents.
XML is a data format for standardized structured document exchange. More information on XML can be found in our XML Tutorial.
This extension uses the Expat XML parser.
Expat is an event-based parser, it views an XML document as a series of events. When an event occurs, it calls a specified function to handle it.
Expat is a non-validating parser, and ignores any DTDs linked to a document. However, if the document is not well formed it will end with an error message.
Because it is an event-based, non validating parser, Expat is fast and well suited for web applications.
The XML parser functions lets you create XML parsers and define handlers for XML events.
Installation
The XML functions are part of the PHP core. There is no installation needed to use these functions.
PHP XML Parser Functions
| Function | Description |
|---|---|
| utf8_decode() | Decodes an UTF-8 string to ISO-8859-1 |
| utf8_encode() | Encodes an ISO-8859-1 string to UTF-8 |
| xml_error_string() | Returns an error string from the XML parser |
| xml_get_current_byte_index() | Returns the current byte index from the XML parser |
| xml_get_current_column_number() | Returns the current column number from the XML parser |
| xml_get_current_line_number() | Returns the current line number from the XML parser |
| xml_get_error_code() | Returns an error code from the XML parser |
| xml_parse() | Parses an XML document |
| xml_parse_into_struct() | Parses XML data into an array |
| xml_parser_create_ns() | Creates an XML parser with namespace support |
| xml_parser_create() | Creates an XML parser |
| xml_parser_free() | Frees an XML parser |
| xml_parser_get_option() | Returns options from an XML parser |
| xml_parser_set_option() | Sets options in an XML parser |
| xml_set_character_data_handler() | Sets up the character data handler for the XML parser |
| xml_set_default_handler() | Sets up the default data handler for the XML parser |
| xml_set_element_handler() | Sets up start and end element handlers for the XML parser |
| xml_set_end_namespace_decl_handler() | Sets up the end namespace declaration handler |
| xml_set_external_entity_ref_handler() | Sets up the external entity reference handler for the XML parser |
| xml_set_notation_decl_handler() | Sets up notation declaration handler for the XML parser |
| xml_set_object() | Allows to use XML parser within an object |
| xml_set_processing_instruction_handler() | Sets up processing instruction handler |
| xml_set_start_namespace_decl_handler() | Sets up the start namespace declaration handler |
| xml_set_unparsed_entity_decl_handler() | Sets handler function for unparsed entity declarations |
PHP XML Parser Constants
| Constant |
|---|
| XML_ERROR_NONE (integer) |
| XML_ERROR_NO_MEMORY (integer) |
| XML_ERROR_SYNTAX (integer) |
| XML_ERROR_NO_ELEMENTS (integer) |
| XML_ERROR_INVALID_TOKEN (integer) |
| XML_ERROR_UNCLOSED_TOKEN (integer) |
| XML_ERROR_PARTIAL_CHAR (integer) |
| XML_ERROR_TAG_MISMATCH (integer) |
| XML_ERROR_DUPLICATE_ATTRIBUTE (integer) |
| XML_ERROR_JUNK_AFTER_DOC_ELEMENT (integer) |
| XML_ERROR_PARAM_ENTITY_REF (integer) |
| XML_ERROR_UNDEFINED_ENTITY (integer) |
| XML_ERROR_RECURSIVE_ENTITY_REF (integer) |
| XML_ERROR_ASYNC_ENTITY (integer) |
| XML_ERROR_BAD_CHAR_REF (integer) |
| XML_ERROR_BINARY_ENTITY_REF (integer) |
| XML_ERROR_ATTRIBUTE_EXTERNAL_ENTITY_REF (integer) |
| XML_ERROR_MISPLACED_XML_PI (integer) |
| XML_ERROR_UNKNOWN_ENCODING (integer) |
| XML_ERROR_INCORRECT_ENCODING (integer) |
| XML_ERROR_UNCLOSED_CDATA_SECTION (integer) |
| XML_ERROR_EXTERNAL_ENTITY_HANDLING (integer) |
| XML_OPTION_CASE_FOLDING (integer) |
| XML_OPTION_TARGET_ENCODING (integer) |
| XML_OPTION_SKIP_TAGSTART (integer) |
| XML_OPTION_SKIP_WHITE (integer) |
| XML_SAX_IMPL (string) |