Returns system runtime information

# posix_sysconf

(PHP 8 >= 8.3.0)

posix_sysconf — Returns system runtime information

### Description

posix_sysconf(int `$conf_id`): int

Returns system runtime information.

### Parameters

`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`

### Return Values

Returns the numeric value related to `conf_id`

### Examples

Example #1 posix_sysconf() example

Returns the number of active cpus.

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

The above example will output:

    2

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