Php I'；我得到一个错误函数eregi（）

我得到了一个不推荐使用的函数：C:\website\Web\u Intersect\u v1.34\profile.php第231行的函数eregi（）不推荐使用。 我试着使用preg_match（）但那不起作用。我应该使用什么使代码工作

$OSList = array
(
    // Match user agent string with operating systems
    'Windows 3.11' => 'Win16',
    'Windows 95' => '(Windows 95)|(Win95)|(Windows_95)',
    'Windows 98' => '(Windows 98)|(Win98)',
    'Windows 2000' => '(Windows NT 5.0)|(Windows 2000)',
    'Windows XP' => '(Windows NT 5.1)|(Windows XP)',
    'Windows Server 2003' => '(Windows NT 5.2)',
    'Windows Vista' => '(Windows NT 6.0)',
    'Windows 7' => '(Windows NT 6.1)|(Windows NT 7.0)',
    'Windows NT 4.0' => '(Windows NT 4.0)|(WinNT4.0)|(WinNT)|(Windows NT)',
    'Windows ME' => 'Windows ME',
    'Open BSD' => 'OpenBSD',
    'Sun OS' => 'SunOS',
    'Linux' => '(Linux)|(X11)',
    'Mac OS' => '(Mac_PowerPC)|(Macintosh)',
    'QNX' => 'QNX',
    'BeOS' => 'BeOS',
    'OS/2' => 'OS/2',
    'Mac OS' => 'Mac OS',
    'Search Bot'=>'(nuhk)|(Googlebot)|(Yammybot)|(Openbot)|(Slurp)|(MSNBot)|(Ask Jeeves/Teoma)|(ia_archiver)'
);

// Loop through the array of user agents and matching operating systems
foreach($OSList as $CurrOS=>$Match) {
    // Find a match
    if (eregi($Match, $agent)) {
            break;
    } else {
        $CurrOS = "Unknown OS";
    }
}
$device = "$user_device : $CurrOS";

---

错误很明显。阅读大橙色框你能提供

$agent

的值吗？@atoms为什么这很重要？？？@Dagon认为我可以为preg replace

preg_match（'/pattern/I'，…）提供正则表达式现在看它，我不知道这将如何工作无论如何
$agent = $_SERVER['HTTP_USER_AGENT'];
if (preg_match("/iPhone/", $agent)) {
$user_device = "iPhone Mobile";
}   else if (preg_match("/Android/", $agent)) {
$user_device = "Android Mobile";
} else if (preg_match("/IEMobile/", $agent)) {
$user_device = "Windows Mobile";
} else if (preg_match("/Chrome/", $agent)) {
$user_device = "Google Chrome";
} else if (preg_match("/MSIE/", $agent)) {
$user_device = "Internet Explorer";
} else if (preg_match("/Firefox/", $agent)) {
$user_device = "Firefox";
} else if (preg_match("/Safari/", $agent)) {
$user_device = "Safari";
} else if (preg_match("/Opera/", $agent)) {
$user_device = "Opera";
}