php常用数学函数汇总

); //5 echo "
"; echo ceil(3.3); //4 echo "
"; echo ceil(6.999); //7

); //4 echo "
"; echo floor(3.3); //3 echo "
"; echo floor(6.999); //6

); //进行求余操作 echo $x."除以".$y."的浮点数余数为：".$r; //输出结果

result1=log10($num1); $result2=log10($num2); $result3=log10($num3); echo "$num1以10为底的对数为$result1"; echo "
"; echo "$num2以10为底的对数为$result2"; echo "
"; echo "$num3以10为底的对数为$result3"; echo "
";

); //返回指定数值的自然对数 echo "
"; echo log(2); //返回指定数值的自然对数 echo "
"; echo log(1); //返回指定数值的自然对数 echo "
"; echo log(0); //返回指定数值的自然对数 echo "
"; echo log(-1); //返回指定数值的自然对数 // echo sqrt(9); //输出3 echo "
"; echo sqrt(10); //3.16227766... // var_dump(pow(2,8)); //输出256 echo "
"; echo pow(-1,20); //输出1 echo "
"; echo pow(0,0); //输出1 echo "
"; echo pow(-1,4.5); //返回错误