在php文档里
$demo = '';
echo $demo;
如此echo出来的内容我发现没有显示123,，我在网页上查看源码发现其代码为，应该是没有被解析。
有人知道原因吗？
还有如何能使字符串里的php代码在echo出来后依旧能够执行。
回复讨论(解决方案)
echo $demo;
$demo 是字符串，当然是原样输出了
你可以
eval('?>' . $demo);
就使 执行了
我这么写了eval('?>' . $demo);
中的123的确执行了，但我把这个方法用到项目里却报错了
下面这个是我替换字符串并输出的过程
下面是报错
报错已经写得很清楚了，有未定义的常量。
具体你先把要eval的语句输出看看
实际上你只是把标签生成php代码，你替换完标签然后保存为*.php文件
之后再include这个php执行就可以了，不需要eval的。
实际上你只是把标签生成php代码，你替换完标签然后保存为*.php文件
之后再include这个php执行就可以了，不需要eval的。
谢谢！之前用eval虽然最后报错解决，也输出出来了，但在页面的源码里却能查看到被注释的所有php语句。。。
将编译后的字符串保存到.php文件再include是正解
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