计算公式封装

<?phpinclude_once "./connect.php"; $a='$A+$C*$Y+$Z/$S';$sql="INSERT INTO baojia(typename)values('$a')";//$res=$dbh->query($sql);$A=1;$C=5;$Y=3;$Z=4;$S=2;function t($A,$C,$Y,$Z,$S,$dbh){$A;$C;$Y;$Z;$S;$sql="select * from baojia where id=2";$res=$dbh->query($sql);$listarr=$res->fetchAll(2);$zong=$listarr[0]['typename']; $r=eval('return'.$zong.";"); print_r($r); } t($A,$C,$Y,$Z,$S,$dbh); //新例子 $s=4;$a="$s*5+4";$r=eval('$ee='.$a.';');print_r($r);print_r($ee);//测试?>