Programming PHP

The end element handler is called when the parser encounters the end of an element:
my_end_element_handler(parser, element);
It takes two parameters: a reference to the XML parser calling the handler, and the
name of the element that is closing.
Example 11-3 shows an end element handler that formats the element.
Example 11-3. End element handler
function end_element($inParser, $inName) {
echo '</$inName>';
}
Character Data Handler
All of the text between elements (character data, or CDATA in XML terminology) is
handled by the character data handler. The handler you set with the xml_set_
character_data_handler( ) function is called after each block of character data:
xml_set_character_data_handler(parser, handler);
The character data handler takes in a reference to the XML parser that triggered the
handler and a string containing the character data itself:
my_character_data_handler(parser, cdata);
Example 11-4 shows a simple character data handler that simply prints the data.
Example 11-4. Character data handler
function character_data($inParser, $inData) {
echo $inData;
}
Processing Instructions
Processing instructions are used in XML to embed scripts or other code into a document.
PHP code itself can be seen as a processing instruction and, with the tag style, follows the XML format for demarking the code. The XML parser calls
the processing instruction handler when it encounters a processing instruction. Set
the handler with the xml_set_processing_instruction_handler( ) function:
xml_set_processing_instruction(parser, handler);
A processing instruction looks like:
The processing instruction handler takes in a reference to the XML parser that triggered
the handler, the name of the target (for example, “php”), and the processing
instructions:
my_processing_instruction_handler(parser, target, instructions);
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Parsing XML | 267