$iFlag = 2, we entered -
$iFlag = 3, we entered
*/
var $iFlag;
// Which tag did we enter? Ask $sTag!
var $sTag;
// Incremented each time we leave a tag.
// How many items have we left?
// When $iCount equals the maximum headlines, the script exits.
var $iCount;
// How many news lines do you want?
var $iMax_lines;
//
- iformation
var $sTitle;
var $sDescription;
var $sLink;
var $sPubdate;
//
// information
var $sChannel_copyright;
var $sChannel_managingeditor;
var $sChannel_language;
var $sChannel_lastbuilddate;
//
/**********************************************************
*Function: set_max_headlines
*Description: Initialize $iMax_lines, which tells us how
many headlines the user wants.
*Parameters:
$iMax An integer which contains the maximum head-
lines defined by the user.
***********************************************************/
function set_max_headlines($pMax) {
// is the parameter an integer?
if(is_int($pMax) AND $pMax > 0) {
$this->iMax_lines = $pMax;
}
}
/**********************************************************
*Function: startElement
*Description: Initialize $iFlag which will tell us which
tag we entered.
*Parameters:
$pParser The resource identifier used by PHP inter-
nally.
$pTagname This variable will contain the name of the
closing tag.
$pAttributes It will contain an array of the attributes,
which are specified in the document.
Not every RSS document contains attributes,
so this feature is a bonus ;)
***********************************************************/
function startElement($pParser, $pTagname, $pAttributes) {
$this->sTag = $pTagname; // might seem useless at first sight
if($this->sTag == 'CHANNEL') {
$this->iFlag = 1;
}
elseif($this->sTag == 'ITEM') {
$this->iFlag = 2;
}
elseif($this->sTag == 'IMAGE'){
$this->iFlag = 3;
}
}
/**********************************************************
*Function: endElement
*Description: Function to process the information
collected out of the tags.
*Parameters:
$pParser The resource identifier used by PHP internally.
$pTagname This variable will contain the name of the
closing tag.
***********************************************************/
function endElement($pParser, $pTagname) {
// If we enter
if($pTagname == 'ITEM') {
// Check if we have reached the maximum
if($this->iCount == $this->iMax_lines) {
exit();
}
if($this->sDescription == '') {
$this->sDescription = 'unknown';
}
if($this->sPubdate == '') {
$this->sPubdate = 'unknown';
}
// Show the news
printf('%s
', trim($this->sLink), htmlspecialchars(trim($this->sTitle)));
printf('Description: %s
', htmlspecialchars(trim($this->sDescription)));
// Empty the variables for new values
unset($this->sTitle);
unset($this->sDescription);
unset($this->sLink);
unset($this->sPubdate);
// Update counter asscociated with the maximum headlines
$this->iCount++;
}
// If we leave
elseif($pTagname == 'CHANNEL') {
if($this->sChannel_copyright == '') {
$this->sChannel_copyright = 'unknown';
}
if($this->sChannel_managingeditor == '') {
$this->sChannel_managingeditor = 'unknown';
}
if($this->sChannel_language == '') {
$this->sChannel_language = 'unknown';
}
if($this->sChannel_lastbuilddate == '') {
$this->sChannel_lastbuilddate = 'unknown';
}
}
}
/**********************************************************
*Function: characterData
*Description: The actual feed processing happens here.
We collect the data and process them.
*Parameters:
$pParser The resource identifier used by PHP internally.
$pTagname This variable will contain the name of the
closing tag.
***********************************************************/
function characterData($pParser, $pData) {
if($this->iFlag == 1) { // entering
// Here is our sTag used for :)
switch($this->sTag) {
case 'LANGUAGE':
$this->sChannel_language .= $pData;
break;
case 'LASTBUILDDATE':
$this->sChannel_lastbuilddate .= $pData;
break;
case 'COPYRIGHT':
$this->sChannel_copyright .= $pData;
break;
case 'MANAGINGEDITOR':
$this->sChannel_managingeditor .= $pData;
break;
}
}
elseif($this->iFlag == 2) {
switch($this->sTag) {
// entering -
case 'TITLE':
$this->sTitle .= $pData;
break;
case 'DESCRIPTION':
$this->sDescription .= $pData;
break;
case 'LINK':
$this->sLink .= $pData;
break;
case 'PUBDATE':
$this->sPubdate .= $pData;
break;
}
}
}
} // End of class definition.
// Create XML support and setup xml parser.
$xp = xml_parser_create();
$cRss_parser = new RSS_Parser();
xml_set_object($xp, $cRss_parser);
// Ignore whitespaces, allows the parser to skip "space"
// characters in the xml document.
xml_parser_set_option($xp, XML_OPTION_SKIP_WHITE, TRUE);
// Setup the event handlers.
xml_set_element_handler($xp, 'startElement', 'endElement');
xml_set_character_data_handler($xp, 'characterData');
// Set maximum headlines.
$cRss_parser->set_max_headlines(MAX_HEADLINES);
unset($data);
// Open xml file which contains the RSS info.
$fp = fopen(RSS_FILE,'r');
if($fp) {
fflush($fp);
while(!feof($fp)) {
// Read it in chunks of 4 kilobytes.
$data = fread($fp, 4096);
// If the document contains an error,
// HELP!!!
// else calm down.
if(!(xml_parse($xp, trim($data), feof($fp))))
die(sprintf("XML error: %s at line %d",
xml_error_string(xml_get_error_code($xp)),
xml_get_current_line_number($xp)));
}
// Close file pointer and free up XML parser.
fclose($fp);
xml_parser_free($xp);
}
else {
// Error opening RSS file.
die(sprintf("%s %s", OPEN, RSS_FILE));
}
?>