PHP 输出session 验证码与图片不同步，图片总是快一步，求解！
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！
<?
session_start();
function random($len)
{
$srcstr="ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
mt_srand();
$strs="";
for($i=0;$i<$len;$i++){
$strs.=$srcstr[mt_rand(0,35)];
}
return strtoupper($strs);
}
$str=random(4);
$width = 50;
$height = 25;
@header("Content-Type:image/png");
$_SESSION["captcha"] = $str;
//echo $str;
$im=imagecreate($width,$height);
$back=imagecolorallocate($im,0xFF,0xFF,0xFF);
$pix=imagecolorallocate($im,187,230,247);
$font=imagecolorallocate($im,41,163,238);
mt_srand();
for($i=0;$i<1000;$i++)
{
imagesetpixel($im,mt_rand(0,$width),mt_rand(0,$height),$pix);
}
imagestring($im, 5, 7, 5,$str, $font);
imagerectangle($im,0,0,$width-1,$height-1,$font);
imagepng($im);
imagedestroy($im);
$_SESSION["captcha"] = $str;
?>
<img src="captcha.php" width="60" height="22" 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！" />
<?php
/**
* 生成验证码
* 类用法
* $checkcode = new checkcode();
* $checkcode->doimage();
* //取得验证
* $_SESSION['code']=$checkcode->get_code();
session_start();
include './checkcode.class.php';
$checkcode = new checkcode('C:\WINDOWS\Fonts\ARIAL.TTF');
$checkcode->doimage();
$_SESSION['code']=$checkcode->get_code();
*/
class checkcode {
//验证码的宽度
public $width=130;
//验证码的高
public $height=50;
//设置字体的地址
private $font;
//设置字体色
public $font_color;
//设置随机生成因子
public $charset = 'abcdefghkmnprstuvwyzABCDEFGHKLMNPRSTUVWYZ23456789';
//设置背景色
public $background = '#EDF7FF';
//生成验证码字符数
public $code_len = 4;
//字体大小
public $font_size = 20;
//验证码
private $code;
//图片内存
private $img;
//文字X轴开始的地方
private $x_start;
function __construct($fontpath) {
$this->font =$fontpath;
}
/**
* 生成随机验证码。
*/
protected function creat_code() {
$code = '';
$charset_len = strlen($this->charset)-1;
for ($i=0; $i<$this->code_len; $i++) {
$code .= $this->charset[rand(1, $charset_len)];
}
$this->code = $code;
}
/**
* 获取验证码
*/
public function get_code() {
return strtolower($this->code);
}
/**
* 生成图片
*/
public function doimage() {
$code = $this->creat_code();
$this->img = imagecreatetruecolor($this->width, $this->height);
if (!$this->font_color) {
$this->font_color = imagecolorallocate($this->img, rand(0,156), rand(0,156), rand(0,156));
} else {
$this->font_color = imagecolorallocate($this->img, hexdec(substr($this->font_color, 1,2)), hexdec(substr($this->font_color, 3,2)), hexdec(substr($this->font_color, 5,2)));
}
//设置背景色
$background = imagecolorallocate($this->img,hexdec(substr($this->background, 1,2)),hexdec(substr($this->background, 3,2)),hexdec(substr($this->background, 5,2)));
//画一个柜形，设置背景颜色。
imagefilledrectangle($this->img,0, $this->height, $this->width, 0, $background);
$this->creat_font();
$this->creat_line();
$this->output();
}
/**
* 生成文字
*/
private function creat_font() {
$x = $this->width/$this->code_len;
for ($i=0; $i<$this->code_len; $i++) {
imagettftext($this->img, $this->font_size, rand(-30,30), $x*$i+rand(0,5), $this->height/1.4, $this->font_color, $this->font, $this->code[$i]);
if($i==0)$this->x_start=$x*$i+5;
}
}
/**
* 画线
*/
private function creat_line() {
imagesetthickness($this->img, 3);
$xpos = ($this->font_size * 2) + rand(-5, 5);
$width = $this->width / 2.66 + rand(3, 10);
$height = $this->font_size * 2.14;
if ( rand(0,100) % 2 == 0 ) {
$start = rand(0,66);
$ypos = $this->height / 2 - rand(10, 30);
$xpos += rand(5, 15);
} else {
$start = rand(180, 246);
$ypos = $this->height / 2 + rand(10, 30);
}
$end = $start + rand(75, 110);
imagearc($this->img, $xpos, $ypos, $width, $height, $start, $end, $this->font_color);
if ( rand(1,75) % 2 == 0 ) {
$start = rand(45, 111);
$ypos = $this->height / 2 - rand(10, 30);
$xpos += rand(5, 15);
} else {
$start = rand(200, 250);
$ypos = $this->height / 2 + rand(10, 30);
}
$end = $start + rand(75, 100);
imagearc($this->img, $this->width * .75, $ypos, $width, $height, $start, $end, $this->font_color);
}
/**
* 输出图片
*/
private function output() {
header("content-type:image/png\r\n");
imagepng($this->img);
imagedestroy($this->img);
}
}
<?php
session_start();
include './checkcode.class.php';
$checkcode = new checkcode('C:\WINDOWS\Fonts\ARIAL.TTF');
$checkcode->doimage();
$_SESSION['code']=$checkcode->get_code();
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />
</head>
<body >
<form action="submit.php" method="post" name="myform">
<img id='code_img' onclick='this.src=this.src+"&"+Math.random()' src='getimg.php'/>
<input name="code" type="text" class="ipt ipt_reg" />
<input name="submit" value="提交" type="submit"/>
</form>
</body>
</html>
<?php
session_start();
var_dump($_SESSION);
echo "<HR/>";
var_dump($_REQUEST);
