PHP XML ParserFunctions
PHP XML Parser Introduction
XML functions allow you to parse XML documents, but cannot validate them.
XML is a data format for standard structured document exchange. You can, in ourXML Tutorialfind more information about XML.
This extension uses the Expat XML parser.
Expat is an event-based parser that treats XML documents as a series of events. When an event occurs, it calls a specified function to handle it.
Expat is a non-validating parser that ignores any DTD linked to the document. However, if the document is not well-formed, it will end with an error message.
Since it is an event-based, non-validating parser, Expat has the characteristics of being fast and suitable for Web applications.
XML parser functions allow you to create XML parsers and define handlers for XML events.
Installation
XML Parser functions are an integral part of PHP's core. No installation is required to use these functions.
PHP XML Parser Functions
PHP: Indicates the earliest PHP version that supports the function.
| Functions | Description | PHP |
|---|---|---|
| utf8_decode() | Decodes a UTF-8 string to ISO-8859-1. | 3 |
| utf8_encode() | Encodes an ISO-8859-1 string to UTF-8. | 3 |
| xml_error_string() | Gets the error string of an XML parser. | 3 |
| xml_get_current_byte_index() | Gets the current byte index of an XML parser. | 3 |
| xml_get_current_column_number() | Gets the current column number of an XML parser. | 3 |
| xml_get_current_line_number() | Gets the current line number of an XML parser. | 3 |
| xml_get_error_code() | Gets the error code of an XML parser. | 3 |
| xml_parse() | Parses an XML document. | 3 |
| xml_parse_into_struct() | Parses XML data into an array. | 3 |
| xml_parser_create_ns() | Creates an XML parser with namespace support. | 4 |
| xml_parser_create() | Creates an XML parser. | 3 |
| xml_parser_free() | Frees an XML parser. | 3 |
| xml_parser_get_option() | Gets options from an XML parser. | 3 |
| xml_parser_set_option() | Sets options for an XML parser. | 3 |
| xml_set_character_data_handler() | Sets up a character data handler. | 3 |
| xml_set_default_handler() | Sets up a default handler. | 3 |
| xml_set_element_handler() | Sets up start and end element handlers. | 3 |
| xml_set_end_namespace_decl_handler() | Sets up the end namespace declaration handler. | 4 |
| xml_set_external_entity_ref_handler() | Sets up an external entity handler. | 3 |
| xml_set_notation_decl_handler() | Sets up a notation declaration handler. | 3 |
| xml_set_object() | Use XML parser within an object. | 4 |
| xml_set_processing_instruction_handler() | Sets up a processing instruction (PI) handler. | 3 |
| xml_set_start_namespace_decl_handler() | Sets up a start namespace declaration handler. | 4 |
| xml_set_unparsed_entity_decl_handler() | Sets up an unparsed entity declaration handler. | 3 |
PHP XML Parser Constants
| Constants |
|---|
| 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) |