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PHP 字符串轮换后不能运算

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Release： 2016-06-13 11:10:42
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PHP 字符串替换后不能运算
由于把公式写在数据库中：
如 $gongshi="a+b+c";
前台做替换
如a=3；b=4;c=5;
$gongshi=str_ireplace("3","a",$gongshi);
$gongshi=str_ireplace("4","b",$gongshi);
$gongshi=str_ireplace("5","c",$gongshi);
替换成功
3+4+5不能自动计算，该怎么办？


------解决方案--------------------
eval()
Related labels：
eval nbsp str
source：php.cn
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