Comparison with other parsers (1.0)

Parsers

• DiDom
• DomCrawler
• Nokogiri
• Simple HTML DOM
• Zend Dom

Features

DiDom

• Ability to search inside an element

DomCrawler

• Easy work with forms

Simple HTML DOM

• Ability to search inside an element
• Ability to change the original document

Memory usage and execution speed

Test conditions:

1. All parsers are being installed via Composer packet manager
2. Task for parsers - receive all elements by a certain selector from HTML and put their text content out

Three files should be parsed in total:

1. 100 elements ~ 1000 strings ~ 60 KB
2. 1000 elements ~ 10000 strings ~ 600 KB
3. 5000 elements ~ 50000 strings ~ 3000 KB

Script for testing:

require 'vendor/autoload.php';

$filepath = __DIR__.'/../files/'.$argv[1].'.html';
$html = file_get_contents($filepath);

$startMemory = memory_get_usage();
$startTime = microtime(true);

// parsing code

$time = microtime(true) - $startTime;
$memory = memory_get_usage() - $startMemory;

file_put_contents(__DIR__.'/time.txt', $time . PHP_EOL, FILE_APPEND);
file_put_contents(__DIR__.'/memory.txt', $memory . PHP_EOL, FILE_APPEND);

Test results

Memory consumption (bytes)

100 elements

• Nokogiri - 125152
• DiDom - 177024
• Zend Dom - 217120
• DomCrawler - 663632
• Simple HTML DOM - 3093680

1000 elements

• Nokogiri - 1033264
• DiDom - 1671312
• Zend Dom - 1674328
• DomCrawler - 1823800
• Simple HTML DOM - 28418904

5000 elements

• Nokogiri - 4798024
• DiDom - 7662488
• Zend Dom - 7880344
• DomCrawler - 9372056
• Simple HTML DOM - out of memory

Time elapsed (seconds)

100 elements

• DiDom - 0.016069
• Nokogiri - 0.019341
• DomCrawler - 0.032912
• Zend Dom - 0.213485
• Simple HTML DOM - 0.415827

1000 elements

• DiDom - 0.2003519
• Nokogiri - 0.2230408
• DomCrawler - 0.2524929
• Simple HTML DOM - 1.518197
• Zend Dom - 5.382406

5000 elements

• DiDom - 3.876836
• Nokogiri - 4.875494
• DomCrawler - 11.90424
• Zend Dom - 179.160342
• Simple HTML DOM - out of memory