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How can developers ensure that their PHP scripts are compatible with both PHP 4.0 and PHP 5.0 to avoid any compatibility issues?

To ensure compatibility with both PHP 4.0 and PHP 5.0, developers can use conditional statements to check the PHP version and adjust the code accordingly. This can involve checking for specific functions or features that may differ between the two versions and providing alternative implementations for each version.

php 
if (version_compare(PHP_VERSION, '5.0.0', '<')) {
    // PHP 4.0 code here
} else {
    // PHP 5.0 code here
}

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