note 97681 deleted from function.eval by danbrown

Note Submitter: thierrycatrain at gmail dot com ---- This is a secure matheval that can handle maths functions as well. Complements cmr at expansys dot com matheval. <?php function matheval($string) { $function = array( "abs", "acos", "acosh", "asin", "asinh", "atan2", "atan", "atanh", "base_convert", "bindec", "ceil", "cos", "cosh", "decbin", "dechex", "decoct", "deg2rad", "exp", "expm1", "floor", "fmod", "getrandmax", "hexdec", "hypot", "is_finite", "is_infinite", "is_nan", "lcg_value", "log10", "log1p", "log", "max", "min", "mt_getrandmax", "mt_rand", "mt_srand", "octdec", "pi", "pow", "rad2deg", "rand", "round", "sin", "sinh", "sqrt", "srand", "tan", "tanh", ); $chars = array( '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ' ', '(', ')', '/', '*', '-', '+', ); for ($i = 0; $i < strlen($string); $i++) { if (in_array($string[$i], $chars)) continue; $fct = $string[$i]; while (in_array_partial(($fct . $string[$i + 1]), $function)) $fct .= $string[++$i]; if (!in_array($fct, $function)) return ("SECURITY ERROR"); } return (eval("echo " . $string . ";")); } function in_array_partial($string, Array $array) { foreach ($array as $value) if (!strncmp($string, $value, strlen($string))) return (true); return (false); } ?>