PHP5中文手册·Defines a set of constants for retrieval and mass-definition -- 追寻梦想＞编程乐园＞PHP 编程

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. However, this function does not perform as well as anticipated.

For a better-performing solution, try the » hidef extension from PECL.

Note: 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

Example#1 apc_define_constants() example


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

上例将输出：


	PHP5中文手册 apc_compile_file apc_delete APC PHP Manual apc_define_constants (PECL apc:3.0.0-3.0.9) apc_define_constants — Defines a set of constants for 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. However, this function does not perform as well as anticipated. For a better-performing solution, try the » hidef extension from PECL. Note: 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 Example#1 apc_define_constants() example `<?php $constants = array( 'ONE' => 1, 'TWO' => 2, 'THREE' => 3, ); apc_define_constants('numbers', $constants); echo ONE, TWO, THREE; ?>` 上例将输出： 123 参见 apc_load_constants() define() constant() Or the PHP constants reference apc_compile_file apc_delete APC PHP Manual

apc_define_constants

说明

参数

返回值

范例

参见