What are some key differences between PHP versions and how do they impact development?

Key differences between PHP versions include changes in syntax, new features, performance improvements, and security updates. These differences can impact development by affecting the compatibility of code, the efficiency of scripts, and the overall security of applications. 

<?php
// Check the PHP version before using certain functions or features
if (version_compare(PHP_VERSION, '7.0.0', '<')) {
    // Use alternative code for older PHP versions
} else {
    // Use the latest features and functions for PHP 7 and above
}
?>

Keywords

PHP versions backward compatibility deprecated functions performance improvements security patches

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