Install failed on CentOS 5.3
Wow that is a fail...
Do you have php warnings enabled? perhaps some warning was emitted that would help use debug the problem.
Posting the html source of that page might be useful in debugging (or might not, I'm not really sure).
I have exactly this problem. I have tried the hack of Installer.php as suggested by an article in this discussion group but to no avail.
Is this something to do with it?
"If you are installing MediaWiki on CentOS 5.6, use the php53 package instead of php. The php package contains PHP 5.1.x, which is not compatible with the latest version of MediaWiki."
I do not know what the php53 package is.
I have successfully got round this problem by using version 1.15.1 of MediaWiki.
I have updated my php to 5.3.3 but it didn't help.
Here is error log:
[Mon Jul 16 20:20:59 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/ [Mon Jul 16 20:20:59 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/ [Mon Jul 16 20:20:59 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/ [Mon Jul 16 20:20:59 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/ [Mon Jul 16 20:21:00 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/ [Mon Jul 16 20:21:00 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/ [Mon Jul 16 20:21:07 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:07 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:08 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:08 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:08 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:08 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:08 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:08 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:08 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:08 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:08 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:08 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:08 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:08 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:08 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:08 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:09 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:09 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:09 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:09 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:09 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:09 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:09 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:09 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:09 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:09 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:09 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:09 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:09 2012] [error] [client 89.164.121.2] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: support for \\P, \\p, and \\X has not been compiled at offset 192 in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1483, referer: https://www.xxx.com/wiki/mw-config/index.php [Mon Jul 16 20:21:09 2012] [error] [client 89.164.121.2] PHP Warning: array_shift() [<a href='function.array-shift'>function.array-shift</a>]: The argument should be an array in /var/www/vhosts/xxx.com/httpsdocs/wiki/includes/parser/Parser.php on line 1484, referer: https://www.xxx.com/wiki/mw-config/index.php
Does that help?
Might it be that it's some UTF problem with php? Does it have to do with this: http://www.mediawiki.org/wiki/Thread:Project:Support_desk/MediaWiki_v1.19.1_installation:_Compilation_failed:_support_for_%5CP,_%5Cp,_and_%5CX_has_not_been_compiled ?
I believe it is the UTF problem. If possible try to recompile php so that PCRE has full unicode support (or use a package other than default centos package)