// Check if code is a valid built-in code $code = 'USD'; if (isValidBuiltInCode($code)) { echo 'Valid built-in code'; } else { echo 'Invalid built-in code'; }
// Check if code is a valid built-in code $code = 'XYZ'; if (isValidBuiltInCode($code)) { echo 'Valid built-in code'; } else { echo 'Invalid built-in code'; }This example checks whether 'XYZ' is a valid built-in code or not. Package/Library: isValidBuiltInCode is not a specific package/library, it is a built-in function in the PHP language.