symfony/symfony — pull request #10523 by GromNaN (2014-03-24 14:25:32+00:00)
Title: [Debug] Check headers sent before sending PHP response

If the response contents has been sent before an error occurs, PHP triggers the warning "Cannot modify header information - headers already sent".

This change ensure that the useful error message is echoed, while it's impossible to change the HTTP status code and headers.

| Q | A
| ------------- | ---
| Bug fix? | yes
| New feature? | no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets | n/a
| License | MIT
| Doc PR | n/a