本帖最后由 Xdawei 于 2012-04-18 20:07:42 编辑
PHP 输出session 验证码与图片不同步，图片总是快一步，求解！<br /><?<br />session_start();<br />function random($len)<br />{<br />$srcstr="ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";<br />mt_srand();<br />$strs="";<br />for($i=0;$i<$len;$i++){<br />$strs.=$srcstr[mt_rand(0,35)];<br />}<br />return strtoupper($strs);<br />}<br />$str=random(4); <br />$width = 50; <br />$height = 25; <br />@header("Content-Type:image/png");<br />$_SESSION["captcha"] = $str;<br />//echo $str;<br />$im=imagecreate($width,$height);<br />$back=imagecolorallocate($im,0xFF,0xFF,0xFF);<br />$pix=imagecolorallocate($im,187,230,247);<br />$font=imagecolorallocate($im,41,163,238);<br />mt_srand();<br />for($i=0;$i<1000;$i++)<br />{<br />imagesetpixel($im,mt_rand(0,$width),mt_rand(0,$height),$pix);<br />}<br />imagestring($im, 5, 7, 5,$str, $font);<br />imagerectangle($im,0,0,$width-1,$height-1,$font);<br />imagepng($im);<br />imagedestroy($im);<br />$_SESSION["captcha"] = $str;<br />?><br /><br /><br /><img src="captcha.php" style="max-width:90%" style="max-width:90%" border="1" onclick= "this.src='captcha.php?act=captcha&'+Math.random()" style="cursor: pointer; vertical-align:middle" title="看不清？点击更换！" / alt="PHP 输出session 验证码与图片不同步，图片老是快一步，求解" ><br />
------解决方案--------------------这个问题很诡异，最好的方法就是分开。
试试这个吧
checkcode.class.php
<br><?php <br />/**<br> * 生成验证码<br> * 类用法<br> * $checkcode = new checkcode();<br> * $checkcode->doimage();<br> * //取得验证<br> * $_SESSION['code']=$checkcode->get_code();<br> session_start();<br> include './checkcode.class.php';<br> $checkcode = new checkcode('C:\WINDOWS\Fonts\ARIAL.TTF');<br> $checkcode->doimage();<br> $_SESSION['code']=$checkcode->get_code();<br> */<br>class checkcode {<br> //验证码的宽度<br> public $width=130;<br> <br> //验证码的高<br> public $height=50;<br> <br> //设置字体的地址<br> private $font;<br> <br> //设置字体色<br> public $font_color;<br> <br> //设置随机生成因子<br> public $charset = 'abcdefghkmnprstuvwyzABCDEFGHKLMNPRSTUVWYZ23456789';<br> <br> //设置背景色<br> public $background = '#EDF7FF';<br> <br> //生成验证码字符数<br> public $code_len = 4;<br> <br> //字体大小<br> public $font_size = 20;<br> <br> //验证码<br> private $code;<br> <br> //图片内存<br> private $img;<br> <br> //文字X轴开始的地方<br> private $x_start;<br> <br> function __construct($fontpath) {<br> $this->font =$fontpath;<br> }<br> /**<br> * 生成随机验证码。<br> */<br> protected function creat_code() {<br> $code = '';<br> $charset_len = strlen($this->charset)-1;<br> for ($i=0; $icode_len; $i++) {<br> $code .= $this->charset[rand(1, $charset_len)];<br> }<br> $this->code = $code;<br> }<br> <br> /**<br> * 获取验证码<br> */<br> public function get_code() {<br> return strtolower($this->code);<br> }<br> <br> /**<br> * 生成图片<br> */<br> public function doimage() {<br> $code = $this->creat_code();<br> $this->img = imagecreatetruecolor($this->width, $this->height);<br> if (!$this->font_color) {<div class="clear">
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