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PHP中有没有计算“四则混同运算”表达式的简单方法

WBOY
WBOYOriginal
2016-06-13 12:08:49912browse

PHP中有没有计算“四则混合运算”表达式的简单方法?
例如,有一个字符串"11+22+33",怎么得出结果是66?

别说用逆波兰式、压栈出栈啥的,都快忘光了。。。
------解决思路----------------------
echo eval("return $str;");
------解决思路----------------------
$str = "11+22+33";
echo eval("return $str;");

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