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Working
with an xml parser for PHP
The steps
involved in working with a parser are to create the parser first, and
then set the handlers for the tags and the character data in the XML file.
Then the XML file is opened, read, and parsed using the parser and then
the memory taken up by the parser is freed. The XML file is then closed.
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Functions
to handle the tags - starting and ending - are created. A function to
handle the character data is also created. After this the parser is created
using the command like 'xml_parser_create();'. 'xml_set_element_handler();'
and 'xml_set_character_data_handler();' are used to handle the tags and
the character data found in the XML file. The XML parser is passed as
the first argument to these functions.
Parsing of
the XML data can be done by using an 'if' condition so that if parsing
fails you can print out an error. Error printing can be done along with
the line number in which parsing failed so that you can debug them easily.
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