I am trying to start a session using session_start() function. I am using xampp's server. But whenever I include this code, the page doesn't load. If I remove this code, the page loads perfectly. Is it a problem with xampp? This is the code placed at the very beginning of the file without any whitespaces before php tag.

Can somebody help me with this?

This is what Apache log says :

[Fri Mar 04 19:13:09.822907 2016] [mpm_winnt:notice] [pid 5444:tid 508] AH00428: Parent: child process 7200 exited with status 3221225477 -- Restarting.
[Fri Mar 04 19:13:10.738482 2016] [ssl:warn] [pid 5444:tid 508] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 04 19:13:10.800485 2016] [mpm_winnt:notice] [pid 5444:tid 508] AH00455: Apache/2.4.18 (Win32) OpenSSL/1.0.2e PHP/7.0.0 configured -- resuming normal operations
[Fri Mar 04 19:13:10.800485 2016] [mpm_winnt:notice] [pid 5444:tid 508] AH00456: Apache Lounge VC14 Server built: Dec  9 2015 10:17:39
[Fri Mar 04 19:13:10.800485 2016] [core:notice] [pid 5444:tid 508] AH00094: Command line: 'c:\\xampp\\apache\\bin\\httpd.exe -d C:/xampp/apache'
[Fri Mar 04 19:13:10.805024 2016] [mpm_winnt:notice] [pid 5444:tid 508] AH00418: Parent: Created child process 5404
[Fri Mar 04 19:13:12.067176 2016] [ssl:warn] [pid 5404:tid 532] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 04 19:13:12.337492 2016] [ssl:warn] [pid 5404:tid 532] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 04 19:13:12.400429 2016] [mpm_winnt:notice] [pid 5404:tid 532] AH00354: Child: Starting 150 worker threads.