ci验证码每次调用得生成一个不浪费空间吗？
ci验证码每次调用得生成一个图片，那么如果同时有N个人访问得生成N张验证码图片？那样不浪费空间吗？因为生成的验证码不会保存呀~ 就是一个数据信息~ 给浏览器解析成图片~ IvanCI 发表于 2013-8-13 13:44 static/image/common/back.gif
因为生成的验证码不会保存呀~ 就是一个数据信息~ 给浏览器解析成图片~
我试过了，保存了，在指定的目录下生成图片了，然后返回的数组里有指向这个图片的链接，访问几次就生成几张 那你自己动手改改呗～ 那用第三方或者自己搞一个~ 不过验证码图片保存空间不算大~ 无所谓吧~ ichou 发表于 2013-8-14 06:53 static/image/common/back.gif
那你自己动手改改呗～
好的，只是怕自己不知道是不是CI哪里有自动删除的功能，没有就自己改改
IvanCI 发表于 2013-8-14 09:40 static/image/common/back.gif
那用第三方或者自己搞一个~ 不过验证码图片保存空间不算大~ 无所谓吧~
嗯嗯，好的
控制器的代码
控制器#生成验证码
public function code(){
#调用函数生成验证码
$vals = array(
'word_length' => 6,
);
$code = create_captcha($vals);
#将验证码字符串保存到session中
$this->session->set_userdata('code',$code);
}
修改后验证码类<?phpif ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.1.6 or newer
*
* @package CodeIgniter
* @author ExpressionEngine Dev Team
* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
* @license http://codeigniter.com/user_guide/license.html
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* CodeIgniter CAPTCHA Helper
*
* @package CodeIgniter
* @subpackage Helpers
* @category Helpers
* @author ExpressionEngine Dev Team
* @link http://codeigniter.com/user_guide/helpers/xml_helper.html
*/
// ------------------------------------------------------------------------
/**
* Create CAPTCHA
*
* @access public
* @param array array of data for the CAPTCHA
* @param string path to create the image in
* @param string URL to the CAPTCHA image folder
* @param string server path to font
* @return string
*/
if ( ! function_exists('create_captcha'))
{
function create_captcha($data = '', $font_path = '')
{
$defaults = array('word' => '', 'word_length' => 4, 'img_width' => '150', 'img_height' => '30', 'font_path' => '', 'expiration' => 7200);
foreach ($defaults as $key => $val)
{
if ( ! is_array($data))
{
if ( ! isset($$key) OR $$key == '')
{
$$key = $val;
}
}
else
{
$$key = ( ! isset($data[$key])) ? $val : $data[$key];
}
}
/*
if ($img_path == '' OR $img_url == '')
{
return FALSE;
}
if ( ! @is_dir($img_path))
{
return FALSE;
}
if ( ! is_writable($img_path))
{
return FALSE;
}
if ( ! extension_loaded('gd'))
{
return FALSE;
}
// -----------------------------------
// Remove old images
// -----------------------------------
list($usec, $sec) = explode(" ", microtime());
$now = ((float)$usec + (float)$sec);
$current_dir = @opendir($img_path);
while ($filename = @readdir($current_dir))
{
if ($filename != "." and $filename != ".." and $filename != "index.html")
{
$name = str_replace(".jpg", "", $filename);
if (($name + $expiration) < $now)
{
@unlink($img_path.$filename);
}
}
}
@closedir($current_dir);
*/ // -----------------------------------
// Do we have a "word" yet?
// -----------------------------------
if ($word == '')
{
$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$str = '';
for ($i = 0; $i < $word_length; $i++)
{
$str .= substr($pool, mt_rand(0, strlen($pool) -1), 1);
}
$word = $str;
}
// -----------------------------------
// Determine angle and position
// -----------------------------------
$length = strlen($word);
$angle = ($length >= 6) ? rand(-($length-6), ($length-6)) : 0;
$x_axis = rand(6, (360/$length)-16);
$y_axis = ($angle >= 0 ) ? rand($img_height, $img_width) : rand(6, $img_height);
// -----------------------------------
// Create image
// -----------------------------------
// PHP.net recommends imagecreatetruecolor(), but it isn't always available
if (function_exists('imagecreatetruecolor'))
{
$im = imagecreatetruecolor($img_width, $img_height);
}
else
{
$im = imagecreate($img_width, $img_height);
}
// -----------------------------------
//Assign colors
// -----------------------------------
$bg_color = imagecolorallocate ($im, 255, 255, 255);
$border_color = imagecolorallocate ($im, 153, 102, 102);
$text_color = imagecolorallocate ($im, 204, 153, 153);
$grid_color = imagecolorallocate($im, 255, 182, 182);
$shadow_color = imagecolorallocate($im, 255, 240, 240);
// -----------------------------------
//Create the rectangle
// -----------------------------------
ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color);
// -----------------------------------
//Create the spiral pattern
// -----------------------------------
$theta = 1;
$thetac = 7;
$radius = 16;
$circles = 20;
$points = 32;
for ($i = 0; $i < ($circles * $points) - 1; $i++)
{
$theta = $theta + $thetac;
$rad = $radius * ($i / $points );
$x = ($rad * cos($theta)) + $x_axis;
$y = ($rad * sin($theta)) + $y_axis;
$theta = $theta + $thetac;
$rad1 = $radius * (($i + 1) / $points);
$x1 = ($rad1 * cos($theta)) + $x_axis;
$y1 = ($rad1 * sin($theta )) + $y_axis;
imageline($im, $x, $y, $x1, $y1, $grid_color);
$theta = $theta - $thetac;
}
// -----------------------------------
//Write the text
// -----------------------------------
$use_font = ($font_path != '' AND file_exists($font_path) AND function_exists('imagettftext')) ? TRUE : FALSE;
if ($use_font == FALSE)
{
$font_size = 5;
$x = rand(0, $img_width/($length/3));
$y = 0;
}
else
{
$font_size = 16;
$x = rand(0, $img_width/($length/1.5));
$y = $font_size+2;
}
for ($i = 0; $i < strlen($word); $i++)
{
if ($use_font == FALSE)
{
$y = rand(0 , $img_height/2);
imagestring($im, $font_size, $x, $y, substr($word, $i, 1), $text_color);
$x += ($font_size*2);
}
else
{
$y = rand($img_height/2, $img_height-3);
imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_path, substr($word, $i, 1));
$x += $font_size;
}
}
// -----------------------------------
//Create the border
// -----------------------------------
imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $border_color);
// -----------------------------------
//Generate the image
// -----------------------------------
// $img_name = $now.'.jpg';
// ImageJPEG($im, $img_path.$img_name);
// $img = "<img src=\"$img_url$img_name\" width=\"$img_width\" height=\"$img_height\" style=\"border:0;\" alt=\" \" />";
#直接输出
header("Content-Type:image/jpeg");
imagejpeg($im);
ImageDestroy($im);
#返回生成的验证码字符串
return $word;
// return array('word' => $word, 'time' => $now, 'image' => $img);
}
}
// ------------------------------------------------------------------------
/* End of file captcha_helper.php */
/* Location: ./system/heleprs/captcha_helper.php */
视图 <td colspan="2" align="right">
<img src="<?php echo site_url('admin/privilege/code');?>" alt="" onclick= this.src="<?php echo site_url('admin/privilege/code').'/'?>"+Math.random() style="cursor: pointer;" title="看不清？点击更换另一个验证码。"/>
</td>
这个是不需要生成图片的验证码
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