I am building an RSS parser using the SimpleXML Class and I was wondering if using the DOMDocument class would improve the speed of the parser. I am parsing an rss document that is at least 1000 lines and I use almost all of the data from those 1000 lines. I am looking for the method that will take the least time to complete.
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- dony113407 2012-02-20 23:33关注
SimpleXML
andDOMDocument
both use the same parser (libxml2
), so the parsing difference between them is negligible.This is easy to verify:
function time_load_dd($xml, $reps) { // discard first run to prime caches for ($i=0; $i < 5; ++$i) { $dom = new DOMDocument(); $dom->loadXML($xml); } $start = microtime(true); for ($i=0; $i < $reps; ++$i) { $dom = new DOMDocument(); $dom->loadXML($xml); } $stop = microtime(true) - $start; return $stop; } function time_load_sxe($xml, $reps) { for ($i=0; $i < 5; ++$i) { $sxe = simplexml_load_string($xml); } $start = microtime(true); for ($i=0; $i < $reps; ++$i) { $sxe = simplexml_load_string($xml); } $stop = microtime(true) - $start; return $stop; } function main() { // This is a 1800-line atom feed of some complexity. $url = 'http://feeds.feedburner.com/reason/AllArticles'; $xml = file_get_contents($url); $reps = 10000; $methods = array('time_load_dd','time_load_sxe'); echo "Time to complete $reps reps: "; foreach ($methods as $method) { echo $method,": ",$method($xml,$reps), " "; } } main();
On my machine I get basically no difference:
Time to complete 10000 reps: time_load_dd: 17.725028991699 time_load_sxe: 17.416455984116
The real issue here is what algorithms you are using and what you are doing with the data. 1000 lines is not a big XML document. Your slowdown will not be in memory usage or parsing speed but in your application logic.
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