How can PHP developers optimize the processing of mathematical expressions to improve performance and efficiency in their applications?

When processing mathematical expressions in PHP, developers can optimize performance and efficiency by using the eval() function to evaluate the expressions. This function allows for the direct execution of PHP code stored in a string, eliminating the need for additional parsing or processing steps. By using eval() strategically and securely, developers can streamline the evaluation of mathematical expressions in their applications.

$expression = "2 + 3 * 4";
$result = eval("return $expression;");
echo $result;