How can PHP version differences between servers affect the functionality of a website?

PHP version differences between servers can affect the functionality of a website if the code uses features or functions that are only available in a specific PHP version. To solve this issue, it is important to ensure that the code is compatible with the lowest PHP version supported by all servers. This can be achieved by checking the PHP version at runtime and using alternative functions or methods if necessary. 

// Check PHP version and use alternative functions if necessary
if (version_compare(PHP_VERSION, '7.0.0') >= 0) {
    // Code that requires PHP 7.0 or higher
} else {
    // Code that is compatible with PHP 5.x
}

Keywords

PHP version server compatibility website functionality backward compatibility error handling

Related Questions