Hello

I have a strange problem. We have two servers and I run a php script on them. The script contains only one <?php header("Location....");?> line.

I know there are some hidden character at the beginnig of the scriptfile. The strange thing is the script runs without error on one server, but it generates a "header already sent.." error on another server.

If you know any solution, please reply!

Thanks
hs

Hidden characters? Do you mean a byte order mark (Wikipedia)? Just remove it. PHP does not recognize it anyway (which IMHO is a good thing, as it makes emitting non-HTML content from PHP simpler). The character set used does not matter to PHP, so just emit a Content-Type header specifying the character set: header('Content-Type: text/html; charset=UTF-8');

If you mean the script begins with a hashbang (AKA shebang, Wikipedia), then the PHP script is intended to be run as a CGI script and not via mod_php. On the problematic server, you need to set that script to be run via mod_cgi, mod_cgid, or mod_fastcgi, and not mod_php. (It should not be difficult to compare the two configurations to see the differences.)

Probably other server has automatic output buffering enabled. You can turn it on your server but this will be stopgap - why you just do not remove these hidden characters from script? Use good editor with option to disable BOM and save it or save in another encoding like Latin1.

Thanks for your answer.
Ok, I know if I remove hidden characters from the file, it will run perfectly. But I would like to know what different settings cause this problem.

Thanks for your answer.
The display of cat -v filename is:

M-oM-;M-?<?

Header( "HTTP/1.1 301 Moved Permanently" );
Header("Location: .....");

?>

The /usr/sbin/apachectl -t -D DUMP_MODULES -M command shows same output for both server:

core_module (static)
authn_file_module (static)
authn_default_module (static)
authz_host_module (static)
authz_groupfile_module (static)
authz_user_module (static)
authz_default_module (static)
auth_basic_module (static)
include_module (static)
filter_module (static)
deflate_module (static)
log_config_module (static)
logio_module (static)
env_module (static)
expires_module (static)
headers_module (static)
unique_id_module (static)
setenvif_module (static)
version_module (static)
proxy_module (static)
proxy_connect_module (static)
proxy_ftp_module (static)
proxy_http_module (static)
proxy_scgi_module (static)
proxy_ajp_module (static)
proxy_balancer_module (static)
ssl_module (static)
mpm_prefork_module (static)
http_module (static)
mime_module (static)
dav_module (static)
status_module (static)
autoindex_module (static)
asis_module (static)
suexec_module (static)
cgi_module (static)
dav_fs_module (static)
dav_lock_module (static)
negotiation_module (static)
dir_module (static)
actions_module (static)
userdir_module (static)
alias_module (static)
rewrite_module (static)
so_module (static)
suphp_module (shared)


But some php module aren't installed on problematic server, which are installed on another server. These are:
apc, wddx, uploadprogress,soap.

How you saved this file, which editor are you using?

Vim and I used to :wq command

I have installed apc php module and problem is resolved Thanks for all. I guess apc uses output buffering (?) nevertheless output_buffering php.ini variable is 0.

hs

In vim you can enter a command to remove these hidden characters when saving file.