10 个有用的 PHP 代码

//获取浏览器IP地址
function getRemoteIPAddress()
{
    $ip = $_SERVER['REMOTE_ADDR'];
    return $ip;
}

//如果有代理服务器的情况下获取IP
function getRealIPAddress()
{    
    if (!empty($_SERVER['HTTP_CLIENT_IP']))
    { // check ip from share internet
        $ip = $_SERVER['HTTP_CLIENT_IP'];
    }
    elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
    { // to check ip is pass from proxy
        $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    }
    else
    {
        $ip = $_SERVER['REMOTE_ADDR'];
    }
    return $ip;

}

//获取 MySQL 时间戳
$query = "select UNIX_TIMESTAMP(date_field) as mydate from mytable where 1=1";
$records = mysql_query($query) or die(mysql_error());
while ($row = mysql_fetch_array($records))
{
    echo $row;
}

//验证日期格式：YYYY-MM-DD
function checkDateFormat($date)
{
    // match the format of the date
    if (preg_match("/^([0-9]{4})-([0-9]{2})-([0-9]{2})$/", $date, $parts))
    {
        // check whether the date is valid of not
        if (checkdate($parts[2], $parts[3], $parts[1]))
        {    
            return true;
        }
        else
        {    
            return false;
        }
    }
    else
    {
        return false;
    }
}

//重定向
header('Location: http://www.php100.com');

//发送邮件
$to = "someone@oschina.net";
$subject = "Your Subject here";
$body = "Body of your message here you can use HTML too. e.g.Bold ";
$headers = "From: You\r\n";
$headers .= "Reply-To: info@yoursite.com\r\n";
$headers .= "Return-Path: info@yoursite.com\r\n";
$headers .= "X-Mailer: PHP\n";
$headers .= 'MIME-Version: 1.0' . "\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
mail($to, $subject, $body, $headers);

//BASE64 编码和解码
function base64url_encode($plainText)
{
    $base64 = base64_encode($plainText);
    $base64url = strtr($base64, '+/=', '-_,');
    return $base64url;
}

function base64url_decode($plainText)
{
    $base64url = strtr($plainText, '-_,', '+/=');
    $base64 = base64_decode($base64url);
    return $base64;
}

//JSON 处理
$json_data = array(    'id' => 1,    'name' => "John",    'country' => 'Canada',    "work" => array(        "Google",        "Oracle"    ));
echo json_encode($json_data);
$json_string = '{"id":1,"name":"John","country":"Canada","work":["Google","Oracle"]} ';
$obj = json_decode($json_string);

// print the parsed data
echo $obj->name; //displays John
echo $obj->work[0]; //displays Google


//检测用户浏览器类型
$useragent = $_SERVER['HTTP_USER_AGENT'];
echo "Your User Agent is: " . $useragent;

//显示网页源码
$lines = file('http://www.php100.com/index.php');
foreach ($lines as $line_num => $line)
{
    // loop thru each line and prepend line numbers
    echo "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "<br>\n";
}

//调整服务器时间
$now = date('Y-m-d-G');
$now = strftime("%Y-%m-%d-%H", strtotime("$now -8 hours"));