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# apc_define_constants

(PECL apc >= 3.0.0)

apc_define_constants — Defines a set of constants for retrieval and mass-definition

### Beschreibung

bool apc_define_constants ( string `$key` , array `$constants` [, bool `$case_sensitive` = true ] )

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.

> Hinweis: 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).

### Parameter-Liste

`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.

### Rückgabewerte

Gibt bei Erfolg `TRUE` zurück. Im Fehlerfall wird `FALSE` zurückgegeben.

### Beispiele

Beispiel #1 apc_define_constants() example

`<?php
$constants = array(
'ONE' => 1,
'TWO' => 2,
'THREE' => 3,
);
apc_define_constants('numbers', $constants);
echo ONE, TWO, THREE;
?>`

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

    123

### Siehe auch

- apc_load_constants() - Loads a set of constants from the cache
- define() - Definiert eine benannte Konstante
- constant() - Liefert den Wert einer Konstante
- Or the PHP constants reference

apc_dec
apc_delete_file
APC Funktionen
PHP Manual