Have I coded this correctly?

[Rohit Patel]

I have created an online PHP code executor at http://web.guru99.com
Though I have checked all security aspects … do you experts see any major flaw that I need to care of?

[David H. Lipman]

I have created an online PHP code executor at hxxp://web. guru99.com
Though I have checked all security aspects … do you experts see any major flaw that I
need
to care of?

The flaw is your spamming by ***@gmail.com, ***@gmail.com or any of
the other names you are posting this by.