如果isset PHP不工作？

Question

好吧，我试图设置一个验证码，但是在这个代码中，它会中断。

if(isset($_POST["captcha"])) 
    if($_SESSION["captcha"]==$_POST["captcha"]) 

当我这样做，页面工作，但验证码是让不正确的提交通过。

Parse error: syntax error, unexpected '"', expecting T_STRING or T_VARIABLE or T_NUM_STRING in /hermes/waloraweb085/b2027/moo.lutarinet/jointest.php on line 71

<?php 

$pagetitle = "Home"; 

$checkrank = 0; 

include ($_SERVER['DOCUMENT_ROOT'].'/header.inc.php'); 

ECHO <<<END 

<br><br> 

<b><center><i><u>DO NOT</u> USE YOUR NEOPETS PASSWORD OR PIN NUMBER!!!</b></i></center> 
<p> 
?> 


<?php session_start() ?> 
<center><P><FORM ACTION="join.pro.php" enctype="multipart/form-data" METHOD=POST> 
    <table width="393" height="188" border="0" cellpadding="0" cellspacing="0"> 
     <td width="150">Username</td> 
     <td width="243"><input type=text name="name" value="" size=32 maxlength=15></td> 
    </tr> 
    <tr> 
     <td>Password</td> 
     <td><input type=password name="pass1" VALUE="" maxlength=15></td> 
    </tr> 
    <tr> 
     <td>Confirm Password</td> 
     <td><input type=password name="pass2" VALUE="" size=32 maxlength=15></td> 
    </tr> 
    <tr> 
     <td>Security Code (4 Diget Number)</td> 
     <td><input type=password name="security" VALUE="" size=32 maxlength=4></td> 
    </tr> 
    <tr> 
     <td>Email Address</td> 
     <td><INPUT TYPE=text NAME="email" VALUE="" SIZE=32 maxlength=100></td> 
    </tr> 
    <tr> 
     <td height="41" colspan="2" valign="middle"><p><p><center> 
     By registering an account here you agree to all 

     of our <A HREF="$baseurl/tos.php">Terms and 

     Conditions</A>. You can also view our <A HREF="$baseurl/privacy.php">Privacy 

    Policy</A>. 
     </center></p></td> 
    </tr> 

<tr><td align="center">CAPTCHA:<br> 
    (antispam code, 3 black symbols)<br> 
    <table><tr><td><img src="captcha.php" alt="captcha image"></td><td><input type="text" name="captcha" size="3" maxlength="3"></td></tr></table> 
</td></tr> 
<td height="27" colspan="2" valign="middle"> 
     <center><input type=submit name=Submit value="Register"></center> 
     </td> 
</table> 
</form> 
<?php 
if(isset($_POST["captcha"])) 
if($_SESSION["captcha"]==$_POST["captcha"]) 
{ 
    //CAPTHCA is valid; proceed the message: save to database, send by e-mail ... 
    echo 'CAPTHCA is valid; proceed the message'; 
} 
else 
{ 
    echo 'CAPTHCA is not valid; ignore submission'; 
} 
?> 


<?php 



END; 




include ($_SERVER['DOCUMENT_ROOT'].'/footer.inc.php'); 


?> 

captcha.php

<?php 
session_start(); 
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); 
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); 
header("Cache-Control: no-store, no-cache, must-revalidate"); 
header("Cache-Control: post-check=0, pre-check=0", false); 
header("Pragma: no-cache"); 

function _generateRandom($length=6) 
{ 
    $_rand_src = array(
     array(48,57) //digits 
     , array(97,122) //lowercase chars 
//  , array(65,90) //uppercase chars 
    ); 
    srand ((double) microtime() * 1000000); 
    $random_string = ""; 
    for($i=0;$i<$length;$i++){ 
     $i1=rand(0,sizeof($_rand_src)-1); 
     $random_string .= chr(rand($_rand_src[$i1][0],$_rand_src[$i1][1])); 
    } 
    return $random_string; 
} 

$im = @imagecreatefromjpeg("http://sketchedneo.com/images/sitedesigns/captcha.jpg"); 
$rand = _generateRandom(3); 
$_SESSION['captcha'] = $rand; 
ImageString($im, 5, 2, 2, $rand[0]." ".$rand[1]." ".$rand[2]." ", ImageColorAllocate ($im, 0, 0, 0)); 
$rand = _generateRandom(3); 
ImageString($im, 5, 2, 2, " ".$rand[0]." ".$rand[1]." ".$rand[2], ImageColorAllocate ($im, 255, 0, 0)); 
Header ('Content-type: image/jpeg'); 
imagejpeg($im,NULL,100); 
ImageDestroy($im); 
?> 

请帮助的人？

71行：如果（isset（$ _ POST [ “验证码”]））

72行：如果（$ _ SESSION [ “验证码”] == $ _ POST [ “验证码”]）

Answer 1

编辑：

你错过END;：

ECHO <<<END 

<br><br> 

<b><center><i><u>DO NOT</u> USE YOUR NEOPETS PASSWORD OR PIN NUMBER!!!</b></i></center><p> 

END; // You forgot to include this 

顺便说一句，session_start()应该叫你的脚本的第一件事它需要在任何其他输出启动之前完成。

另外，尽量让你的括号，以便与多线分支（使得它更容易扫描）：

if (isset($_POST["captcha"])) 
{ 
    if ($_SESSION["captcha"] == $_POST["captcha"]) 
    { 
     //CAPTHCA is valid; proceed the message: save to database, send by e-mail ... 
     echo 'CAPTHCA is valid; proceed the message'; 
    } 
    else 
    { 
     echo 'CAPTHCA is not valid; ignore submission'; 
    } 
} 

Answer 2

if(isset($_POST["captcha"])) 
if($_SESSION["captcha"]==$_POST["captcha"]) 
{ 
    //CAPTHCA is valid; proceed the message: save to database, send by e-mail ... 
echo 'CAPTHCA is valid; proceed the message'; 
} 
else 
{ 
    echo 'CAPTHCA is not valid; ignore submission'; 
} 

你缺少一个大括号在第一次如果...

if(isset($_POST['captcha'])) 
{ 
    if($_SESSION['captcha'] == $_POST['captcha']) 
    { 
     //CAPTHCA is valid; proceed the message: save to database, send by e-mail ... 
     echo 'CAPTHCA is valid; proceed the message'; 
    } 
    else 
    { 
     echo 'CAPTHCA is not valid; ignore submission'; 
    } 
} 
// Need another else for first if here or keep it closed if you don't have an else