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With the continuous popularity of the Internet, page loading time, as an important indicator of user experience, is of great significance for website optimization and performance tuning. During the testing process, how to accurately measure page loading time becomes an important issue. This article will introduce how to use PHP WebDriver to test page loading time.
1. Introduction to PHP WebDriver
PHP WebDriver is a PHP development tool based on Selenium WebDriver. It controls the browser to perform page operations by calling the browser's underlying driver. Using PHP WebDriver, you can implement automated testing, crawling and other functions of web pages.
2. Test method of page loading time
Before testing the page loading time, we need to understand several concepts:
Based on the above concepts, the following tests can be performed:
When the browser starts drawing Page, we can use 'first-paint' in the Performance Timing API to get the first rendering time. The code is as follows:
$driver->get('http://www.baidu.com'); $performance = $driver->executeScript('return window.performance.timing'); $firstPaint = $performance['responseStart'] - $performance['navigationStart']; echo "First Paint Time: " . $firstPaint . "ms ";
Due to browser caching, the first rendering may not be complete, so we need a more accurate method to test First Contentful Paint (FCP).
Using the browser's Observer API to obtain the timestamp of recent content changes, you can implement the function of measuring FCP. The sample code is as follows:
$driver->get('http://www.baidu.com'); $driver->executeScript('function observerCallback(entries) { entries.forEach(entry => { if(entry.entryType == "paint" && entry.name == "first-contentful-paint") { console.log(entry.startTime); return entry.startTime; } }); } var observer = new PerformanceObserver(observerCallback); observer.observe({entryTypes: ["paint"]});');
For First Interactive Time, you can test it by monitoring the DOMContentLoaded event. The sample code is as follows:
$driver->get('http://www.baidu.com'); $driver->executeScript('function ti() { var ti = window.performance.timing.domContentLoadedEventEnd - window.performance.timing.navigationStart; console.log(ti); return ti; } return {ti: ti()};');
The full page loading time can be obtained through the navigation timing API. The sample code is as follows:
$driver->get('http://www.baidu.com'); $performance = $driver->executeScript('return window.performance.timing'); $pageLoadTime = $performance['loadEventEnd'] - $performance['navigationStart']; echo "Page Load Time: " . $pageLoadTime . "ms ";
3. Conclusion
The page loading time can be tested through PHP WebDriver Help us better understand page performance and provide important reference for optimizing the website. This article introduces how to use PHP WebDriver to test page loading time. Readers can implement it accordingly based on their actual situation.
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