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How important is it to check the PHP manual for function availability before using it in a script?

It is crucial to check the PHP manual for function availability before using it in a script to ensure that the function exists in the PHP version you are using. This helps prevent errors and compatibility issues that may arise when running the script on different PHP environments.

php 
if (function_exists('function_name')) {
    // Function is available, proceed with using it
    function_name();
} else {
    // Function is not available, handle the situation accordingly
    echo 'Function not available in this PHP version.';
}

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