I have PHP 5.4.11 VC9 and Apache 2.4.3 (apacheLounge) running on Win XP SP3.
I wanted to use mb_convert_encoding, but i got:
PHP Fatal error: Call to undefined function mb_convert_encoding()
I have found that I need to enable the extension php_mbstring.dll. But when I remove the ; at the beginning and restart Apache, in my php error log file I get:
[26-Jan-2013 19:40:13 UTC] PHP Warning: PHP Startup: in Unknown on line 0
[26-Jan-2013 19:40:15 UTC] PHP Warning: PHP Startup: in Unknown on line 0
I have tried to disable it and enable other extensions, but I get the same error (the two lines each time). And if I disable all extensions, there is no error.
Ah, and when I enable php_mbstring.dll, it doesn't work because I can't call mb_convert_encoding()
I have resolved it adding the PHP folder to the PATH and restarting the computer.