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XML_PullParser Introduction to Coding 2: Adding Attributes &version; Turner Myron Contents The previous section dealt with extracting character data from XML tags. Still using Example 1 from that section, we'll look at extracting the ip attributes from the server elements.
Listing 3 1. while($token = $parser->XML_PullParser_getToken()) 2. { 3. $parser->XML_PullParser_getElement('server'); 4. while($server = $parser->XML_PullParser_nextElement()) 5. { 6. $attr_array = $parser->XML_PullParser_getAttributes($server); 7. $ip = $parser->XML_PullParser_getAttrVal("ip",$attr_array); 8. echo "Server IP: $ip\n"; 9. } 10. echo "\n"; 11. } /* Result Server IP: 192.168.0.1 Server IP: 192.168.0.2 Server IP: 192.168.0.3 Server IP: 192.168.0.4 Server IP: 192.168.0.5 */
What's new here are lines 6 and 7. XML_PullParser_getAttributes takes a $server object and returns an associative array of attribute names and values for each server. This array could be addressed in the usual manner: $ip = $attr_array['ip']. This is exactly what XML_PullParser_getAttrVal does, with one difference: it converts the index term to upper case if case-folding is in effect, which is the default for the PHP XML parser. What follows is a small routine that puts together attribute handling with getting the character data from elements.
Listing 4 1. while($token = $parser->XML_PullParser_getToken()) 2. { 3. 4. $parser->XML_PullParser_getElement('server'); 5. 6. while($server = $parser->XML_PullParser_nextElement()) 7. { 8. echo "Server Name: " . $parser->XML_PullParser_getText($server) ."\n"; 9. $attr_array = $parser->XML_PullParser_getAttributes($server); 10. $ip = $parser->XML_PullParser_getAttrVal("ip",$attr_array); 11. echo "Server IP: $ip\n"; 12. } 13. } /* Result Server Name: example_1.com Server IP: 192.168.10.1 Server Name: example_2.com Server IP: 192.168.10.2 Server Name: example_3.com Server IP: 192.168.10.3 */
Everything here is familiar. It's Listing 3 with the addition of line 8, which calls XML_PullParser_getText, a function introduced in Listing 2 of the previous section. The next section will look at at how to create the XML_PullParser object. Introduction to Coding 1 Instantiating the XML_PullParser Class