10个实用的PHP代码片段

转载于：http://bbs.phpchina.com/thread-241137-1-1.html

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.phpchina.com');
exit;

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

$lines = file('http://www.phpchina.com/index.php');
foreach ($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"));