What are the best practices for building function names dynamically in PHP?

When building function names dynamically in PHP, it is important to follow best practices to ensure readability and maintainability of the code. One common approach is to use a consistent naming convention and clearly define the criteria for generating function names. Additionally, it is recommended to sanitize and validate any input used to dynamically build function names to prevent potential security vulnerabilities. 

// Example of dynamically building function names in PHP
$prefix = 'calculate_';
$operation = 'sum';

// Construct the function name
$functionName = $prefix . $operation;

// Define the function dynamically
if (!function_exists($functionName)) {
    function {$functionName}($num1, $num2) {
        return $num1 + $num2;
    }
}

// Call the dynamically created function
$result = $functionName(5, 3);
echo $result; // Output: 8

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