java会话变量在Jquery脚本中不可见？

1 年，2 月 Questions & Answers 1035

我试图在表单中实现验证码

有三个文件：

html表单

php验证码图像生成器

php验证码检查器

一切正常，但我似乎无法在我的验证码检查器脚本上检索验证码脚本创建的会话变量

形式如下：

<img src="captcha/captcha.php"></img>
<input type="text" id="CAPTCHA"><p id="caperror"></p>
<p><input name="B1" type="submit" value="Submit" />
</form> 

<script>
$('#contactform').submit(function () {
    var cap = $('#CAPTCHA').val();
    cap = 'CAPTCHA=' + cap;
    $.ajax({
        type: 'POST',
        url: 'captcha/capcheck.php',
        data: cap,
        success: success,
        dataType: "text",
        error: postfail
    });
});

function success(result) {
    if (result == 'true') {
        alert('Correct');
        return true;
    } else {
        alert(result);
        return false;
    }
}

function postfail() {
    alert('post failed');
    return false;
}
</script>

会话变量['CAPTCHA']在CAPTCHA中生成。php脚本

我试图找回它，并在capcheck中检查它。包含以下内容的php脚本：

<?php 
session_start();  

if($SESSION['CAPTCHA']) {
echo 'session='.$SESSION['CAPTCHA'];
}
if((isset($POST['CAPTCHA'])) && (isset($SESSION['CAPTCHA']))){
if($_SESSION['CAPTCHA'] != $_POST['CAPTCHA']) {

    echo 'false';


    } else {
    session_destroy();
        echo 'true';
}

}
else{
echo $_POST['CAPTCHA'].'    '. $SESSION['CAPTCHA'];
session_destroy();
}
?>

它总是空的，我不知道为什么！我在另一个站点上实现了它，没有jquery，而且它工作得非常完美

验证码。php:

    <?php

        session_start();

        /**
         * Send PNG headers to the browser
        **/
        header('content-type: image/png');

        $numbers    = array();
        $numbers[]  = rand(1, 5);
        $numbers[]  = rand(1, 5);

        if(rand(0, 1) == 0) {
            $_op                        = '+'; 
            $code                       = strval($numbers[0]) .' + ' .strval($numbers[1]) .' =';
            $_SESSION['CAPTCHA'] = $numbers[0] + $numbers[1];
        } else {
            $_op                        = '+';  
            $code                       = strval($numbers[0]) .' + ' .strval($numbers[1]) .' =';
            $_SESSION['CAPTCHA'] = $numbers[0] + $numbers[1];
        }
        session_write_close();

        /* Our TTF font file, you may use others */
        $font = dirname(__FILE__) .'/fonts/arial.ttf';

        /* set the width */
        $width  = 16;
        //$width  = (strlen($code) * $width) + 2;   
        $height = 24;

        $code_length = 7;

        $image_height = $height + 2;
        $image_width  = $width * $code_length + 20;

        $im       = imagecreatetruecolor($image_width, $image_height);
        $white  = imagecolorallocate($im, 255, 255, 255);
        imagefill($im, 0, 0, $white);

        /* Some themes */
        $theme   = array();
        $theme[]    = array('CHAR_COLOR' => 
                                array('R' => array(56, 21),
                                        'G' => array(85, 25),
                                        'B' => array(14, 195) 
                                        ),
                               'BG_COLOR' =>
                                array('R' => array(12, 76),
                                        'G' => array(54, 67),
                                        'B' => array(26, 23) 
                                        )
                             );
        $theme[]    = array('CHAR_COLOR' => 
                                array('R' => array(59, 72),
                                        'G' => array(35, 55),
                                        'B' => array(65, 63) 
                                        ),
                               'BG_COLOR' =>
                                array('R' => array(30, 55),
                                        'G' => array(70, 30),
                                        'B' => array(70, 30) 
                                        )
                             );
        $theme[]    = array('CHAR_COLOR' => 
                                array('R' => array(76, 25),
                                        'G' => array(38, 50),
                                        'B' => array(58, 78) 
                                        ),
                                'BG_COLOR' =>
                                array('R' => array(94, 30),
                                        'G' => array(97, 30),
                                        'B' => array(30, 55) 
                                        )
                             );

        $pos_x  = 5;
        $pos_y  = 20;
        $random = rand(0, (count($theme) - 1) );/* Get a random theme */

        /**
         *  Place each character into the image 
        **/
        $angle  = 0;
        $size      = 16;
        for($i = 0, $count = strlen($code); $i < $count; $i++) {

            $color  = imagecolorallocate($im, 
                                                  rand($theme[$random]['CHAR_COLOR']['R'][0], $theme[$random]['CHAR_COLOR']['R'][1]), 
                                                  rand($theme[$random]['CHAR_COLOR']['G'][0], $theme[$random]['CHAR_COLOR']['G'][1]), 
                                                  rand($theme[$random]['CHAR_COLOR']['B'][0], $theme[$random]['CHAR_COLOR']['B'][1])
                                                  );        

            imagettftext($im, $size, $angle, $pos_x, $pos_y, $color, $font, $code{$i});
            $pos_x  += $width + 1;

        }

        /* Finally show image */
        imagepng($im);  
        imagedestroy($im);  
    ?>

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java会话变量在Jquery脚本中不可见？

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