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<?php    
function GetIP() {
    if(!empty($_SERVER["HTTP_CLIENT_IP"]))
       $cip = $_SERVER["HTTP_CLIENT_IP"];
    else if(!empty($_SERVER["HTTP_X_FORWARDED_FOR"]))    
       $cip = $_SERVER["HTTP_X_FORWARDED_FOR"];
    else if(!empty($_SERVER["REMOTE_ADDR"]))   
       $cip = $_SERVER["REMOTE_ADDR"];
    else  
       $cip = "ÎÞ·¨»ñÈ¡£¡";
    return $cip;
}
echo GetIP();
?>
<br />PHP»ñÈ¡IP·½·¨¶þ£º
<?
error_reporting (E_ERROR | E_WARNING | E_PARSE);
if($HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"]){
    $ip = $HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"];
}
elseif($HTTP_SERVER_VARS["HTTP_CLIENT_IP"]){  
    $ip = $HTTP_SERVER_VARS["HTTP_CLIENT_IP"];
}
elseif ($HTTP_SERVER_VARS["REMOTE_ADDR"]){
    $ip = $HTTP_SERVER_VARS["REMOTE_ADDR"];
}
elseif (getenv("HTTP_X_FORWARDED_FOR")){
    $ip = getenv("HTTP_X_FORWARDED_FOR");
}
elseif (getenv("HTTP_CLIENT_IP")){
    $ip = getenv("HTTP_CLIENT_IP");
}
elseif (getenv("REMOTE_ADDR")){
    $ip = getenv("REMOTE_ADDR");
}
else{
    $ip = "Unknown";
}
echo $ip;
?>
<br />PHP»ñÈ¡IP·½·¨Èý£º
<? $iipp = $_SERVER["REMOTE_ADDR"]; echo $iipp; ?>
<br />PHP»ñÈ¡IP·½·¨ËÄ£º
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<?php
$s = "new string";
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$str_1 = "Ë«ÒýºÅÖ¸¶¨µÄ×Ö·û´®£¬$s";
//ÏÂÃæË«ÒýºÅ×Ö·û´®ÖеķûºÅ"$"×öÁËתÒ壬Òò´Ë$sÔ­·â²»¶¯£¬²»»á±»Ì滻Ϊ±äÁ¿$sµÄÖµ
$str_2 = "Ë«ÒýºÅÖ¸¶¨µÄ×Ö·û´®£¬\$s";
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<?php
 
 
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  $sum = date("Y-m-d");
  $sum1 = date("y-m-d");
 
  echo "$sum<br/>";
  echo "$sum1<br/>";
 
  //md5¼ÓÃܺ¯Êý
  $pass = md5("ÕÅÈý");
  ......

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