求大神给指点下这些代码有什么问题啊，为什么session变量不生效啊
<?php require_once('Connections/yiwuyiwu.php'); ?><?phpif (!function_exists("GetSQLValueString")) {function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") { $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue; $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue); switch ($theType) { case "text": $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL"; break; case "long": case "int": $theValue = ($theValue != "") ? intval($theValue) : "NULL"; break; case "double": $theValue = ($theValue != "") ? "'" . doubleval($theValue) . "'" : "NULL"; break; case "date": $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL"; break; case "defined": $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue; break; } return $theValue;}}mysql_select_db($database_yiwuyiwu, $yiwuyiwu);$query_Recordset1 = "SELECT * FROM `user`";$Recordset1 = mysql_query($query_Recordset1, $yiwuyiwu) or die(mysql_error());$row_Recordset1 = mysql_fetch_assoc($Recordset1);$totalRows_Recordset1 = mysql_num_rows($Recordset1);?><?php// *** Validate request to login to this site.if (!isset($_SESSION)) { session_start();}// ***session变量开始了$loginFormAction = $_SERVER['PHP_SELF'];if (isset($_GET['accesscheck'])) { $_SESSION['PrevUrl'] = $_GET['accesscheck'];}if (isset($_POST['Username'])) { $loginUsername=$_POST['Username']; $password=(md5($_POST['Password'])); $MM_fldUserAuthorization = "enable"; $MM_redirectLoginSuccess = "index.php"; $MM_redirectLoginFailed = "zhuce.php"; $MM_redirecttoReferrer = false; //*** 输入账号和密码，判断转向页面。 mysql_select_db($database_yiwuyiwu, $yiwuyiwu); $LoginRS__query=sprintf("SELECT u_id u_name, pass, enable FROM `user` WHERE u_name=%s AND pass=%s", //*** 启用符号是这个“·” GetSQLValueString($loginUsername, "text"), GetSQLValueString($password, "text")); $LoginRS = mysql_query($LoginRS__query, $yiwuyiwu) or die(mysql_error()); $row_LoginRS = mysql_fetch_assoc($LoginRS); $loginFoundUser = mysql_num_rows($LoginRS); if ($loginFoundUser) { $loginStrGroup = mysql_result($LoginRS,0,'enable'); //*** 声明三个会话变量并分配值 $_SESSION['MM_Username'] = $loginUsername; $_SESSION['MM_UserGroup'] = $loginStrGroup; $_SESSION['u_id']= $row_LoginRS('u_id'); if (isset($_SESSION['PrevUrl']) && false) { $MM_redirectLoginSuccess = $_SESSION['PrevUrl']; } header("Location: " . $MM_redirectLoginSuccess ); } else { header("Location: ". $MM_redirectLoginFailed ); }}?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title></title></head><body> <h3 id="登录系统">登录系统</h3> <hr /><form ACTION="<?php echo $loginFormAction; ?>" id="form1" name="form1" method="POST"> <table width="250" border="1" align="center" cellpadding="0" cellspacing="0"> <tr> <td colspan="2" nowrap="nowrap" bgcolor="#3366CC"><div align="center"><font color="#FFFFFF">用户登陆</font></div></td> </tr> <tr> <td width="100" nowrap="nowrap"><div align="right"><font color="#000000">用户名:</font></div></td> <td width="235"> <div align="left"> <input name="Username" type="text" id="Username" /> </div></td> </tr> <tr> <td width="100" nowrap="nowrap"><div align="right"><font color="#000000">密码:</font></div></td> <td width="235"> <div align="left"> <input name="Password" type="password" id="Password" value="" /> </div></td> </tr> <tr> <td colspan="2"><div align="right"> <a href="/test/zhuce.php">注册</a> <input type="submit" name="Submit" value="登陆" /> </div></td> </tr> </table></form></body></html><?phpmysql_free_result($Recordset1);?>
回复讨论(解决方案)
你怎么知道没有生效的？
你怎么知道没有生效的？
因为登录以后我计划用session变量做了if语句，结果if语句没生效
你用了哪个session，你可以echo一下看是否有值。
你把相关代码贴出来
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