# posix_sysconf

(PHP 8 >= 8.3.0)

posix_sysconf — Returns system runtime information

### 说明

posix_sysconf(int `$conf_id`): int

Returns system runtime information.

### 参数

`conf_id`

  Identifier of the variable with the following constants `POSIX_SC_ARG_MAX`, `POSIX_SC_PAGESIZE`, `POSIX_SC_NPROCESSORS_CONF`, `POSIX_SC_NPROCESSORS_ONLN`, `POSIX_SC_CHILD_MAX`, `POSIX_SC_CLK_TCK`

### 返回值

Returns the numeric value related to `conf_id`

### 示例

示例 #1 posix_sysconf() example

Returns the number of active cpus.

`<?php
echo posix_sysconf(POSIX_SC_NPROCESSORS_ONLN);
?>`

以上示例会输出：

    2

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