Changes to INI file handling
  
   PHP 5.3.0 has significantly improved performance and parsing of INI files,
   and adds several new syntax features.
  
  
   - 
    
     The standard php.ini files have been re-organized and renamed. 
     php.ini-development contains settings recommded
     for use in development environments. php.ini-production
     contains settings recommended for use in production environments.
    
   
- 
    
     There is now support for two special sections:
     [PATH=/opt/httpd/www.example.com/] and 
     [HOST=www.example.com]. Directives set in these 
     sections cannot be overridden by user-defined INI files or at 
     runtime. More information about these sections can be found 
     here.
    
   
- 
    
     zend_extension_debug,
     zend_extension_debug_ts
     and zend_extension_ts have
     been removed. Use the
     zend_extension directive to
     load all Zend Extensions.
    
   
- 
    
     zend.ze1_compatibility_mode
     has been removed. If this INI directive is set to On, an
     E_ERRORerror is emitted at startup.
- 
    
     It is now possible to use the full path to load modules using the 
     extension directive.
    
   
- 
    
     "ini-variables" can now be used almost anywhere in a
     php.ini file.
    
   
- 
    
     open_basedir restrictions may now
     be tighted at runtime, and the directive is now PHP_INI_ALL.
    
   
- 
    
     It is now possible to use alphanumeric or variable indices in INI option
     arrays.
    
   
- 
    
     get_cfg_var() is now able to return "array" INI options.
    
   
- 
    
     Two new mail directives:
     mail.add_x_header and
     mail.log, have been added.
    
   
   The following new ini directives have been added:
  
  
   - 
    
     user_ini.filename and
     user_ini.cache_ttl have been added to control the use
     of user INI files.
    
   
- 
    
     exit_on_timeout has been added
     to force Apache 1.x children to exit if a PHP execution timeout occurs.
    
   
- 
    
     Added mbstring.http_output_conv_mimetype. 
     This directive specifies the regex pattern of content types for which 
     mb_output_handler() is activated.
    
   
- 
    
     Added request_order.
     Allows controlling which external variables will be available in
     $_REQUEST.
    
   
   The following ini directives have new default values: