php $_SERVER[REMOTE_ADDR] 记录访问者IP地址日志

实例源代码如下：

<?php

$address = $_SERVER[\'REMOTE_ADDR\'];
$referer = $_SERVER[\'HTTP_REFERER\'];
$browser = $_SERVER[\'HTTP_USER_AGENT\'];

$file = fopen(\"log.html\",  \"a\");  

$time = date(\"H:i dS F\");
fwrite( $file, \"<b>Time:</b> $time<br>\" );

if( $address != null)
{
  fwrite( $file, \"<b>IP Address:</b> $address <br>\");
}  

if( $referer != null)
{
  fwrite( $file, \"<b>Referer:</b> $referer<br>\");  
}

fwrite( $file, \"<b>Browser:</b> $browser<br/><hr>\");  

fclose($file);

?>