10个必看的PHP小代码，很实用！

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\’);

  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”));