New Directives
    There were some new php.ini directives introduced in PHP 5. Here is a
    list of them:
   
     mail.force_extra_paramaters - Force the addition of the specified
     parameters to be passed as extra parameters to the sendmail binary. These
     parameters will always replace the value of the 5th parameter to
     mail(), even in safe mode
   
     register_long_arrays -
     allow/disallow PHP to register the deprecated long $HTTP_*_VARS
   
      session.hash_function -
      select a hash function (MD5 or SHA-1)
   
      session.hash_bits_per_character
      - define how many bits are stored in each character when converting the
      binary hash data to something readable (from 4 to 6)
   
     zend.ze2_compatibility_mode - Enable compatibility mode with Zend Engine 1 (PHP 4)