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Filename : sysinfo.lib.php
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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * Library for extracting information about system memory and cpu.
 * Currently supports all Windows and Linux platforms
 *
 * This code is based on the OS Classes from the phpsysinfo project
 * (https://phpsysinfo.github.io/phpsysinfo/)
 *
 * @package PhpMyAdmin-sysinfo
 */
if (! defined('PHPMYADMIN')) {
    exit;
}

define(
    'MEMORY_REGEXP',
    '/^(MemTotal|MemFree|Cached|Buffers|SwapCached|SwapTotal|SwapFree):'
    . '\s+(.*)\s*kB/im'
);

/**
 * Returns OS type used for sysinfo class
 *
 * @param string $php_os PHP_OS constant
 *
 * @return string
 */
function PMA_getSysInfoOs($php_os = PHP_OS)
{

    // look for common UNIX-like systems
    $unix_like = array('FreeBSD', 'DragonFly');
    if (in_array($php_os, $unix_like)) {
        $php_os = 'Linux';
    }

    return ucfirst($php_os);
}

/**
 * Gets sysinfo class mathing current OS
 *
 * @return \PMA\libraries\SysInfo|mixed sysinfo class
 */
function PMA_getSysInfo()
{
    $php_os = PMA_getSysInfoOs();
    $supported = array('Linux', 'WINNT', 'SunOS');

    if (in_array($php_os, $supported)) {
        $class_name = 'PMA\libraries\SysInfo' . $php_os;
        /** @var \PMA\libraries\SysInfo $ret */
        $ret = new $class_name();
        if ($ret->supported()) {
            return $ret;
        }
    }

    return new \PMA\libraries\SysInfo();
}