PHP写的求多项式导数的函数代码，需要的朋友可以参考下

复制代码 代码如下: <?php function getDerivativeByFormulaAndXDATA($formula, $x_data){ $xArray = explode(“+”, $formula); $Derivative = 0; foreach ($xArray as $x_record) { $tmpArray = explode(“x^”, $x_record); if(count($tmpArray) == 2){ $coefficient = $tmpAr