After installation of XOOPS 2.2.3 Final, i got this kind of msg

Notice [PHP]: Only variables should be assigned by reference in file kernel/profile.php line 94
Notice [PHP]: Only variables should be assigned by reference in file include/common.php line 215
Notice [PHP]: Only variables should be assigned by reference in file kernel/config.php line 239
Notice [PHP]: Only variables should be assigned by reference in file kernel/config.php line 239
Notice [PHP]: Only variables should be assigned by reference in file kernel/groupperm.php line 229
Notice [PHP]: Only variables should be assigned by reference in file kernel/blockinstance.php line 169
Notice [PHP]: Only variable references should be returned by reference in file kernel/module.php line 1349
Notice [PHP]: Only variable references should be returned by reference in file kernel/blockinstance.php line 111
Notice [PHP]: Only variables should be assigned by reference in file modules/system/blocks/system_blocks.php line 151
Notice [PHP]: Only variables should be assigned by reference in file kernel/groupperm.php line 229
Notice [PHP]: Only variables should be assigned by reference in file modules/system/blocks/system_blocks.php line 154
Notice [PHP]: Only variables should be assigned by reference in file modules/system/blocks/system_blocks.php line 159


how to solve it

These notices are of no consequence. I believe I read somewhere they are do to php issues or MySQL issues but they are just notices and as far as I know are being worked out in upcoming versions but they don't cause any problems.
To get rid of them showing go to your administration/system/preferences/general settings and turn of PHP debug, then click GO.

Quest

thanks. problem solve.