What are some key differences between PHP versions that developers should be aware of?

One key difference between PHP versions that developers should be aware of is the introduction of new features and functions in newer versions, which may not be supported in older versions. To ensure compatibility across different PHP versions, developers should check the PHP documentation for deprecated functions and features before using them in their code. 

// Check if a function exists before calling it
if (function_exists('some_function')) {
    some_function();
}

Keywords

PHP 7 backward compatibility performance improvements scalar type declarations error handling.

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