How can developers ensure their PHP code is compatible with different PHP versions when switching between servers?

Developers can ensure their PHP code is compatible with different PHP versions by using version-specific functions, checking for deprecated functions, and testing their code on different PHP versions. One way to easily switch between servers with different PHP versions is to use version_compare() function to check the PHP version running on the server and adjust the code accordingly. 

if (version_compare(PHP_VERSION, '7.0.0') >= 0) {
    // Code for PHP 7 and above
} else {
    // Code for PHP 5.x
}

Keywords

PHP version compatibility server migration PHP functions error handling backward compatibility

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