\u5728\u4e00\u4e9b\u60c5\u51b5\u4e0b\uff0c\u7ed9\u5b9a\u4e86\u8ba1\u7b97\u516c\u5f0f\uff0c\u4f46\u662f\u8fd9\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u600e\u4e48\u5e94\u7528\u8fd9\u4e2a\u8ba1\u7b97\u5462\uff1f<\/p>\n
\u5728PHP\u91cc\uff0c\u6709eval\u51fd\u6570\uff1a<\/p>\n
$a=3;
\n$b=12;
\n$str=’2*($a+$b)’;
\n$result=eval(“return $str;”);
\necho $result;<\/p>\n
\u5728lua\u91cc\uff0c\u6709loadstring\u51fd\u6570\uff1a<\/p>\n
jisuan1=”function jisuan1(x) return x+5 end”
\nif jisuan1~=nil then
\nloadstring(jisuan1)()
\n–assert(loadstring(jisuan1))() –\u68c0\u67e5\u8fd4\u56de\u662f\u5426\u4e3a\u7a7a\uff0c\u6700\u540e\u7684\u62ec\u53f7\u8868\u793a\u6267\u884c\u3002
\nprint(jisuan1(6))
\nend<\/p>\n
\u8fd9\u6837\u5c31\u53ef\u4ee5\u9002\u5408\u4e0e\u5728\u6570\u636e\u5e93\u4e2d\u5b58\u50a8\u4e86\u8ba1\u7b97\u516c\u5f0f\uff0c\u5230\u9700\u8981\u5f97\u5230\u7ed3\u679c\u7684\u65f6\u5019\u8c03\u7528\u8ba1\u7b97\uff0c\u5f97\u5230\u6700\u7ec8\u7ed3\u679c\u3002<\/p>\n
<\/p>\n
lua\u4ee3\u7801\u5e94\u7528\uff0cjisuan\u6570\u7ec4\u4fdd\u5b58\u4e86\u8ba1\u7b97\u516c\u5f0f\uff0ci\u53ef\u4ee5\u7528\u4e8e\u8ba1\u7b97\u516c\u5f0f\u7684\u504f\u79fb\u91cf\u3002\u6839\u636ei\u7684\u503c\u5c31\u53ef\u4ee5\u8ba1\u7b97\u4e0d\u540c\u7684\u516c\u5f0f\u3002\u5e76\u4e14\uff0cjisuan\u516c\u5f0f\u91cc\u53ea\u5199x\u7684\u76f4\u63a5\u5173\u7cfb\u5373\u53ef\u3002<\/p>\n
a=2
\njisuan={“x+5″,nil,”x*3”}
\ni=1
\nif jisuan[i] ~= nil then
\nloadstring(“function jisuan(x) return “..jisuan[i]..” end”)()
\n–assert(loadstring(jisuan))()
\nprint(jisuan(a))
\nelse
\nprint(a)
\nend<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728\u4e00\u4e9b\u60c5\u51b5\u4e0b\uff0c\u7ed9\u5b9a\u4e86\u8ba1\u7b97\u516c\u5f0f\uff0c\u4f46\u662f\u8fd9\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u600e\u4e48\u5e94\u7528\u8fd9\u4e2a\u8ba1\u7b97\u5462\uff1f \u5728PHP … \u7ee7\u7eed\u9605\u8bfb