apc_define_constants Defines a set of constants for retrieval and mass-definition &reftitle.description; boolapc_define_constants stringkey arrayconstants boolcase_sensitivetrue define is notoriously slow. Since the main benefit of APC is to increase the performance of scripts/applications, this mechanism is provided to streamline the process of mass constant definition. However, this function does not perform as well as anticipated. For a better-performing solution, try the hidef extension from PECL. To remove a set of stored constants (without clearing the entire cache), an empty array may be passed as the constants parameter, effectively clearing the stored value(s). &reftitle.parameters; key The key serves as the name of the constant set being stored. This key is used to retrieve the stored constants in apc_load_constants. constants An associative array of constant_name => value pairs. The constant_name must follow the normal constant naming rules. value must evaluate to a scalar value. 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. &reftitle.returnvalues; &return.success; &reftitle.examples; 1, 'TWO' => 2, 'THREE' => 3, ); apc_define_constants('numbers', $constants); echo ONE, TWO, THREE; ?> ]]> &example.outputs; &reftitle.seealso; apc_load_constants define constant Or the PHP constants reference