How can PHP developers optimize their code to include JavaScript only for specific browsers, such as Firefox?

To include JavaScript only for specific browsers, such as Firefox, PHP developers can use browser detection techniques to determine the user's browser and conditionally load the JavaScript file based on the browser type. This can be achieved by checking the user agent string provided by the browser and then including the JavaScript file only if the browser matches the desired criteria. 

<?php
$browser = $_SERVER['HTTP_USER_AGENT'];

if (strpos($browser, 'Firefox') !== false) {
    echo '<script src="firefox-specific-script.js"></script>';
}
?>

Keywords

PHP JavaScript browser detection conditional loading optimization

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