的Joomla 2.5 JFactory ::的getSession();似乎是缓存在Firefox [英] Joomla 2.5 JFactory::getSession(); seems to be caching in firefox
问题描述
我有一个PHP文件中包含的目录。它的易用性是显示验证码图片。 在该文件中我这样设置会话变量:
I have a php file in includes directory. It's usability is to display a captcha Image. In that file I set a session variable like this:
$code = codegenerator();
$session =& JFactory::getSession();
$session->set('security_code', $code);
此会话变量是从图像中设定的的src
调用,从一个控制器方法。
This Session variable is set from an image src
that calls that method from a controller.
然后,我打电话控制器检查所设定的会议 (此方法trigerd从一个iframe AJAX),并在该方法我这样做
Then I call a controller to check that session that was set (this method is trigerd with ajax from an iframe) and in that method I do this
$session = JFactory::getSession();
$seccode=$session->get('security_code');
echo $seccode.':'.rand();
其结果是如预期的第一次,所设定的code和一个随机数。
如果我刷新页面验证码图片被重设一个新的code和被显示出来。
但是,当我再次TRIGER支票时,我得到了previous code有一个新的随机数。
这兰特()
有一个证明, JFactory ::的getSession();
的缓存,因为我得到了新的随机数量,但同样的previous code,而不是像预想的那样新。所以它不是阿贾克斯就是在这里缓存的东西。
The result is as expected the first time, the code that was set and a random number.
If I refresh that page the captcha image gets reset with a new code and gets displayed.
But when I triger the check event again, I get the previous code with a new random number.
That rand()
there is a proof that JFactory::getSession();
is cached because I get the new random number but the same previous code and not the new as supposed to. So it's not that ajax that is caching something here.
我怎样才能避免 JFactory ::的getSession();
歌厅从Firefox缓存?
这种情况只有在firefox。 Internet Explorer和Chrome浏览器似乎正确显示会话code。如果我清除Firefox的现金和刷新页面,它仍然无法正常工作。这就像它的缓存,直到永远。如果我关闭Firefox,然后再次打开它,那么一切似乎工作的第一次,但后来我再有同样的问题。
How can I avoid JFactory::getSession();
geting cached from firefox?
This happens only in firefox. Internet explorer and chrome seem to display the session code correctly. If I clear firefox cash and refresh the page it still doesn't work. It's like it's cached for ever. If I close firefox and open it again, then everything seems to work as the first time, but then I have the same issue again.
下面是code产生的验证码
Here is the code that generates the captcha
<?php
defined('_JEXEC') or die('Restricted access');
class CaptchaSecurityImages {
var $font='monofont.ttf';
function generateCode($characters) {
/* list all possible characters, similar looking characters and vowels have been removed */
$possible = '23456789bcdfghjkmnpqrstvwxyz';
$code = '';
$i = 0;
while ($i < $characters) {
$code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
$i++;
}
return $code;
}
function CaptchaSecurityImages($width='220',$height='40',$characters='6') {
$code = $this->generateCode($characters);
//$font='includes'.DS.'monofont.ttf';
$font='monofont.ttf';
$this->font=$font;
$session =& JFactory::getSession();
$session->set('security_code', $code);
/* font size will be 75% of the image height */
$font_size = $height * 0.75;
$image = @imagecreate($width, $height) or die('Cannot initialize new GD image stream');
/* set the colours */
$background_color = imagecolorallocate($image, 255, 255, 255);
$text_color = imagecolorallocate($image, 20, 40, 100);
$noise_color = imagecolorallocate($image, 100, 120, 180);
/* generate random dots in background */
for( $i=0; $i<($width*$height)/3; $i++ ) {
imagefilledellipse($image, mt_rand(0,$width), mt_rand(0,$height), 1, 1, $noise_color);
}
/* generate random lines in background */
for( $i=0; $i<($width*$height)/150; $i++ ) {
imageline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $noise_color);
}
/* create textbox and add text */
$textbox = imagettfbbox($font_size, 0, $this->font, $code) or die('Error in imagettfbbox function');
$x = ($width - $textbox[4])/2;
$y = ($height - $textbox[5])/2;
imagettftext($image, $font_size, 0, $x, $y, $text_color, $this->font , $code) or die('Error in imagettftext function');
/* output captcha image to browser */
header('Content-Type: image/jpeg');
imagejpeg($image);
imagedestroy($image);
}
}
?>
这里是调用的阿贾克斯code
And here is the code that is called by the ajax
public function checkCaptchaSecurityCode(){
$securitycode = JRequest::getVar('securitycode');
$session = JFactory::getSession();
$seccode=$session->get('security_code');
echo $seccode.':'.rand();
die();
}
和这里是Ajax调用
<?php $checkCaptchaSecurityCode = JRoute::_('index.php?option=com_virtuemart&view=participate&task=checkCaptchaSecurityCode&tmpl=component&format=raw'); ?>
jQuery.ajaxSetup({cache: false});
jQuery.ajax({
type: "POST",
url: "<?php echo $checkCaptchaSecurityCode ?>",
cache: false,
data: { securitycode: jQuery("#security_code").val() }
}).done(function( msg ) {
alert( msg );
});
请帮忙
推荐答案
我有同样的问题,但设置固定的问题一个新的会话变量之前调用clear方法。
I had the same problem, but calling the clear method before setting a new session variable fixed the problem.
$session = & JFactory::getSession();
/* this way unset data from the session store */
$session->clear('security_code');
/* and now set the new value */
$session->set('security_code', $code);
它的工作原理,即使是您第一次声明一个会话变量。
It works even if is the first time you are declaring a session variable.
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