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PHP 手册
apc_define_constants
(PECL)
apc_define_constants -- Defines a set of constants for later retrieval and mass-definition
说明
bool apc_define_constants ( string key, array constants [, bool case_sensitive] )
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.
注: 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).
参数
- 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.
返回值
如果成功则返回 TRUE，失败则返回 FALSE。
范例
例子 1. apc_define_constants() example
<?php
$constants = array(
'ONE' => 1,
'TWO' => 2,
'THREE' => 3,
);
apc_define_constants('numbers', $constants);
apc_load_constants('numbers');
echo ONE, TWO, THREE;
?> |
上例将输出：
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