Description:
------------
After upgrading to php5.4 on my Debian (configured to "testing" sources for apt)
none of my local website works.
After upgrade I used option "maintainer's version of php.ini" for all php.ini files (apache, fpm, cli).
Version of Apache: 2.2.22
Here what I see in one of my error log files (Apaches's):
[Sun Mar 25 13:32:54 2012] [error] [client 127.0.0.1] PHP Fatal error:  Call to undefined function (null)() in /home/web/ccc/frontend/index.php on line 4
Actually, this is regular Yii fremework's frontpage. Nothing was changed and worked perfect before upgrade.

Test script:
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     1<?php
       2                                                                                                                                                                            
     3  // change the following paths if necessary                                                                                                                                
     4  $yii=dirname(__FILE__).'/../framework/yii.php';                                                                                                                           
     5  $config=dirname(__FILE__).'/protected/config/main.php';
     6
     7  // remove the following lines when in production mode
     8  defined('YII_DEBUG') or define('YII_DEBUG',true);
     9  // specify how many levels of call stack should be shown in each log message
    10  defined('YII_TRACE_LEVEL') or define('YII_TRACE_LEVEL',3);
    11
    12  require_once($yii);
    13  Yii::createWebApplication($config)->run();

Expected result:
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dirname() must be called without error producing and should return full path to the current file.

Actual result:
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PHP Fatal error:  Call to undefined function (null)() in /home/web/ccc/frontend/index.php on line 4