CodeIgniter header already sent and ob_start() at the beginning of index.php

Question

In my application, I can ensure that there is no such a “un-intentional” whitespace or whatever. I don’t perform “echo” at controller or model, but there is always “header already sent” error on the log file (Nothing shown in browser). I don't have any closing php tag too. The only "suspicious" thing is I load session and input library at both, the model and the controller. This is actually not a big problem, but the error become terrible if I use CLI request. After browsing a while, I find this answer at stack overflow: https://stackoverflow.com/a/13783368/755319 It said that I can add ob_start() for output buffering at the beginning of index.php ``` <?php ob_start(); /* *--------------------------------------------------------------- * APPLICATION ENVIRONMENT *--------------------------------------------------------------- ``` Is is save to do such a thing? EDIT: Okay, I might be wrong and miss something here. Is there any programmatic way to find what's wrong? (A program to find wr…

Accepted Answer

Output generated by the first warning will trigger the second warning (i.e: Cannot modify header information ). In theory, if you solve the first warning, the second should auto-fix.

Open `system/core/Input.php` and at line #351 replace:

```
$this->ip_address = $_SERVER['REMOTE_ADDR'];
```

with:

```
$this->ip_address = $this->server('remote_addr');
```

CodeIgniter header already sent and ob_start() at the beginning of index.php

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