What are the potential consequences of using outdated PHP and HTML resources for learning?

Using outdated PHP and HTML resources for learning can lead to security vulnerabilities, compatibility issues with newer technologies, and inefficient coding practices. To solve this issue, it is important to stay updated with the latest versions of PHP and HTML standards, as well as best coding practices. 

<?php
// Example of using the latest PHP version (PHP 7) with secure coding practices
declare(strict_types=1);

function addNumbers(int $a, int $b): int {
    return $a + $b;
}

echo addNumbers(5, 10);
?>

Keywords

Outdated PHP HTML resources Deprecated functions Security vulnerabilities Compatibility issues

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