Online PHP editor | perf for 1fFB3

<?php /** * This code demonstrates the performance difference when calling * DOMElement::C14N() on generated DOMDocument versus on a DOMDocument that was * loaded from a string. * * Calling DOMDocument::normalizeDocument() doesn't make any difference. * * Output example: * Testing with 500 items * Native DOM (not normalized)… 2.55357 seconds * Native DOM (normalized)… 2.52199 seconds * Export and re-import DOM… 0.06444 seconds */ define('NUMBER_OF_ITEMS', 200); define('XML_NAME_SPACE', 'http://example.com/xml'); echo sprintf('Testing with %d items', NUMBER_OF_ITEMS) . PHP_EOL; echo 'Generated DOM… '; $nativeDOM = generate_random_dom(); $s = microtime(true); iterate_with_xpath($nativeDOM); echo number_format(microtime(true) - $s, 5) . ' seconds' . PHP_EOL; echo 'Generated DOM with normalizeDocument()… '; $nativeDOMNormalized = generate_random_dom(); $s = microtime(true); $nativeDOMNormalized->normalizeDocument(); iterate_with_xpath($nativeDOMNormalized); echo number_format(microtime(true) - $s, 5) . ' seconds' . PHP_EOL; echo 'Export and re-import DOM… '; $dom3 = generate_random_dom(); $s = microtime(true); $importedXmlString = new \DOMDocument('1.0', 'UTF-8'); $importedXmlString->loadXML($dom3->saveXML()); iterate_with_xpath($importedXmlString); echo number_format(microtime(true) - $s, 5) . ' seconds' . PHP_EOL; /** * Iterate over items' content and call C14N * * @param \DOMDocument $dom */ function iterate_with_xpath(\DOMDocument $dom): void { $xpath = new \DOMXPath($dom); $xpath->registerNamespace('listElement', XML_NAME_SPACE); /** @var \DOMElement $item */ foreach($xpath->query('//listElement:alpha', null, XML_NAME_SPACE) as $item) { $item->C14N(); } } /** * Generate random DOMDocument * * Example: * <listElement> * <listItem index="0"> * <alpha>random value here</alpha> * </listItem> * ... * </listElement> * * @return \DOMDocument */ function generate_random_dom(): \DOMDocument { $dom = new \DOMDocument(); $dom->formatOutput = true; /** @var \DOMElement $list */ $list = $dom->createElementNS(XML_NAME_SPACE, 'listElement'); $dom->appendChild($list); for($i = 0; $i < NUMBER_OF_ITEMS; $i++) { /** @var \DOMElement $listItem */ $listItem = $dom->createElementNS(XML_NAME_SPACE, 'listItem'); $listItem->setAttribute('index', $i); $list->appendChild($listItem); $subElement = $dom->createElementNS(XML_NAME_SPACE, 'alpha'); $subElement->appendChild($dom->createTextNode(uniqid('a', true))); $listItem->appendChild($subElement); } return $dom; }

Version	System time (s)	User time (s)	Memory (MiB)
7.3.12	0.007	0.443	15.80
7.3.11	0.007	0.481	15.99
7.3.10	0.003	0.482	15.82
7.3.9	0.003	0.431	15.81
7.3.8	0.003	0.424	15.96
7.3.7	0.007	0.422	15.82
7.3.6	0.000	0.447	15.71
7.3.5	0.010	0.438	15.73
7.3.4	0.007	0.436	15.81
7.3.3	0.006	0.429	15.85
7.3.2	0.008	0.417	17.71
7.3.1	0.008	0.448	17.55
7.3.0	0.007	0.435	17.52
7.2.24	0.003	0.447	16.09
7.2.23	0.003	0.425	16.32
7.2.22	0.000	0.427	16.16
7.2.21	0.003	0.428	16.00
7.2.20	0.007	0.423	16.07
7.2.19	0.003	0.426	15.94
7.2.18	0.003	0.426	16.10
7.2.17	0.007	0.418	16.14
7.2.16	0.005	0.431	16.06
7.2.15	0.008	0.424	17.90
7.2.14	0.013	0.511	17.81
7.2.13	0.013	0.464	17.97
7.2.12	0.008	0.424	18.00
7.2.11	0.008	0.448	17.91
7.2.10	0.013	0.417	17.85
7.2.9	0.010	0.410	18.12
7.2.8	0.010	0.414	17.77
7.2.7	0.010	0.415	17.91
7.2.6	0.006	0.453	17.89
7.2.5	0.013	0.417	17.81
7.2.4	0.011	0.465	17.90
7.2.3	0.005	0.425	17.85
7.2.2	0.007	0.416	17.90
7.2.1	0.011	0.468	17.89
7.2.0	0.003	0.424	17.82
7.1.33	0.007	0.454	16.83
7.1.32	0.003	0.425	16.77
7.1.31	0.003	0.423	16.74
7.1.30	0.007	0.491	16.64
7.1.29	0.007	0.418	16.71
7.1.28	0.010	0.417	16.79
7.1.27	0.008	0.465	16.73
7.1.26	0.007	0.485	16.78
7.1.25	0.003	0.423	16.81