How can server PHP versions affect the functionality of code?

Server PHP versions can affect the functionality of code because different PHP versions may have different features, functions, or syntax that are not backward compatible. To ensure code compatibility across different PHP versions, it is important to check the PHP version running on the server and adjust the code accordingly. This can involve updating deprecated functions, using polyfills, or implementing version checks within the code. 

// Example of version check in PHP code
if (version_compare(PHP_VERSION, '7.0.0') >= 0) {
    // Code for PHP 7 and above
} else {
    // Code for PHP versions below 7
}

Keywords

PHP versions server compatibility code functionality backward compatibility deprecated features

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