In what ways can developers ensure their PHP code remains compatible and functional across multiple PHP versions, such as from PHP 5.2 to PHP 5.5?

To ensure PHP code remains compatible across multiple versions, developers can use conditional checks to detect the PHP version being used and adjust the code accordingly. By checking the PHP version before executing certain functions or features, developers can ensure that their code will work seamlessly across different PHP versions. 

if (version_compare(PHP_VERSION, '5.5.0') >= 0) {
    // Code that is compatible with PHP 5.5 and above
} else {
    // Code that is compatible with PHP 5.2 to PHP 5.4
}

Keywords

backward compatibility PHP versioning code refactoring deprecated functions compatibility testing

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