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字符串转成 数值计算的有关问题

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Release： 2016-06-13 12:54:58
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字符串转成 数值计算的问题
$num1="1";
$num2="3"
$str="*"

要得出 1*3=3
即：$res=$num1如何$str如何$num2=3
用什么方法


------解决方案--------------------
$res= eval("return $num1$str$num2;");<br />
var_dump($res);
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nbsp return str
source：php.cn
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