What potential errors or pitfalls should be considered when defining functions in PHP, especially when using extensions?

When defining functions in PHP, especially when using extensions, potential errors or pitfalls to consider include naming conflicts with existing functions or extensions, incorrect parameter types or order, and missing or incorrect return statements. To avoid these issues, it is important to carefully read the documentation for the extension being used and ensure that function names are unique and follow best practices. 

// Example of defining a function with an extension in PHP
if (!function_exists('my_custom_function')) {
    function my_custom_function($param1, $param2) {
        // Function implementation goes here
        return $result;
    }
}

Keywords

PHP functions extensions errors compatibility debugging

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