Are there any built-in PHP functions or libraries that can safely evaluate mathematical expressions passed via POST requests?

When evaluating mathematical expressions passed via POST requests in PHP, it is important to sanitize and validate the input to prevent code injection attacks. One way to safely evaluate mathematical expressions is to use the `eval()` function along with input validation to ensure only mathematical expressions are being evaluated. 

<?php
// Get the mathematical expression from the POST request
$expression = $_POST['expression'];

// Validate the expression to ensure it contains only allowed characters
if(preg_match('/^[0-9\+\-\*\/\(\)\s]+$/', $expression)){
    // Use eval() function to safely evaluate the mathematical expression
    $result = eval("return $expression;");
    echo "Result: " . $result;
} else {
    echo "Invalid mathematical expression";
}
?>

Keywords

PHP built-in functions libraries mathematical expressions POST requests evaluation.

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