(PECL apc >= 3.0.0)
apc_load_constants — Loads a set of constants from the cache
$key
   [, bool $case_sensitive = true
  ] )Loads a set of constants from the cache.
keyThe name of the constant set (that was stored with apc_define_constants()) to be retrieved.
case_sensitive
       The default behaviour for constants is to be declared case-sensitive;
       i.e. CONSTANT and Constant
       represent different values. If this parameter evaluates to FALSE the
       constants will be declared as case-insensitive symbols.
      
   Returns TRUE on success or FALSE on failure.
  
Example #1 apc_load_constants() example
<?php
$constants = array(
    'ONE'   => 1,
    'TWO'   => 2,
    'THREE' => 3,
);
apc_define_constants('numbers', $constants);
apc_load_constants('numbers');
echo ONE, TWO, THREE;
?>
The above example will output:
123