php图片验证码生成程序代码
这里有两款验证码生成程序，第一款比较好，第二款也不错，同时第二款生成程序用一个完完的实例来说明验证码调用与生成这里有两款验证码生成程序，第一款比较好，第二款也不错，同时第二款生成程序用一个完完的实例来说明验证码调用与生成。*/
session_start();
class authnum {
//图片对象、宽度、高度、验证码长度
private $im;
private $im_width;
private $im_height;
private $len;
//随机字符串、y轴坐标值、随机颜色
private $randnum;
private $y;
private $randcolor;
//背景色的红绿蓝，默认是浅灰色
public $red=238;
public $green=238;
public $blue=238;
/**
* 可选设置：验证码类型、干扰点、干扰线、y轴随机
* 设为 false 表示不启用
**/
//默认是大小写数字混合型，1 2 3 分别表示 小写、大写、数字型
public $ext_num_type='';
public $ext_pixel = false; //干扰点
public $ext_line = false; //干扰线
public $ext_rand_y= true; //y轴随机
function __construct ($len=4,$im_width='',$im_height=25) {
// 验证码长度、图片宽度、高度是实例化类时必需的数据
$this->len = $len; $im_width = $len * 15;
$this->im_width = $im_width;
$this->im_height= $im_height;
$this->im = imagecreate($im_width,$im_height);
}
// 设置图片背景颜色，默认是浅灰色背景
function set_bgcolor () {
imagecolorallocate($this->im,$this->red,$this->green,$this->blue);
}
// 获得任意位数的随机码
function get_randnum () {
$an1 = 'abcdefghijklmnopqrstuvwxyz';
$an2 = 'abcdefghijklmnopqrstuvwxyz';
$an3 = '0123456789';
if ($this->ext_num_type == '') $str = $an1.$an2.$an3;
if ($this->ext_num_type == 1) $str = $an1;
if ($this->ext_num_type == 2) $str = $an2;
if ($this->ext_num_type == 3) $str = $an3;
for ($i = 0; $i < $this->len; $i++) {
$start = rand(1,strlen($str) - 1);
$randnum .= substr($str,$start,1);
}
$this->randnum = $randnum;
$_session[an] = $this->randnum;
}
// 获得验证码图片y轴
function get_y () {
if ($this->ext_rand_y) $this->y = rand(5, $this->im_height/5);
else $this->y = $this->im_height / 4 ;
}
// 获得随机色
function get_randcolor () {
$this->randcolor = imagecolorallocate($this->im,rand(0,100),rand(0,150),rand(0,200));
}
// 添加干扰点
function set_ext_pixel () {
if ($this->ext_pixel) {
for($i = 0; $i < 100; $i++){
$this->get_randcolor();
imagesetpixel($this->im, rand()%100, rand()%100, $this->randcolor);
}
}
}
// 添加干扰线
function set_ext_line () {
if ($this->ext_line) {
for($j = 0; $j < 2; $j++){
$rand_x = rand(2, $this->im_width);
$rand_y = rand(2, $this->im_height);
$rand_x2 = rand(2, $this->im_width);
$rand_y2 = rand(2, $this->im_height);
$this->get_randcolor();
imageline($this->im, $rand_x, $rand_y, $rand_x2, $rand_y2, $this->randcolor);
}
}
}
/**创建验证码图像：
* 建立画布（__construct函数）
* 设置画布背景（$this->set_bgcolor();）
* 获取随机字符串（$this->get_randnum ();）
* 文字写到图片上（imagestring函数）
* 添加干扰点/线（$this->set_ext_line(); $this->set_ext_pixel();）
* 输出图片
**/
function create () {
$this->set_bgcolor();
$this->get_randnum ();
for($i = 0; $i < $this->len; $i++){
$font = rand(4,6);
$x = $i/$this->len * $this->im_width + rand(1, $this->len);
$this->get_y();
$this->get_randcolor();
imagestring($this->im, $font, $x, $this->y, substr($this->randnum, $i ,1), $this->randcolor);
}
$this->set_ext_line();
$this->set_ext_pixel();
header("content-type:image/png");
imagepng($this->im);
imagedestroy($this->im); //释放图像资源
}}//end class
/**使用验证码类的方法：
* $an = new authnum(验证码长度,图片宽度,图片高度);
* 实例化时不带参数则默认是四位的60*25尺寸的常规验证码图片
* 表单页面检测验证码的方法，对比 $_session[an] 是否等于 $_post[验证码文本框id]
* 可选配置：
* 1.验证码类型：$an->ext_num_type=1; 值为1是小写类型，2是大写类型，3是数字类型
* 2.干扰点：$an->ext_pixel = false; 值为false表示不添加干扰点
* 3.干扰线：$an->ext_line = false; 值为false表示不添加干扰线
* 4.y轴随机：$an->ext_rand_y = false; 值为false表示不支持图片y轴随机
* 5.图片背景：改变 $red $green $blue 三个成员变量的值即可
**/
$an = new authnum();
$an->ext_num_type='';
$an->ext_pixel = true; //干扰点
$an->ext_line = false; //干扰线
$an->ext_rand_y= true; //y轴随机
$an->green = 238;
$an->create();
?>
好下面来看一款验证码调用实例
例子demo:
以下为引用的内容：
<!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=gb2312" />
<title>hi.baidu.com/ji_haiyang</title>
</head><body>
<form action ="demo1.php教程" method="post" name="form1">
<input name ="test" type="text" value="1234" />
<div onclick='this.innerhtml="<img src=vcode.php?r="+math.random()+"></img>"'>
<img src="vcode.php"></img>
</div>
<input name ="test2" type="text" value="1" />
<input name ="submit" type="submit" value="submit" />
</form></body>
</html>
例子demo1:<?php
session_start();
$test = $_post['test'];
$test = trim($test);
$submit = $_post['submit'];
if($test==$_session['vcode']){
echo 'true,输入验证码正确';
} else {
echo 'false，输入验证码错误';
}?>
调用文件vcode.php: 以下为引用的内容：
<?php
/**
* 默认验证码session为vcode.即:$_session['vcode'];
* 注意在给变量符值时不要把变量的名子和session冲突
* 注:在验证时不分大小写
*/
include("inc_vcode_class.php");
$v = new vcode;
//$config['width'] = 50; //验证码宽
//$config['height'] = 20; //验证码高
//$config['vcode'] = "vcode"; //检查验证码时用的session
//$config['type'] = "default"; //验证码展示的类型default:大写字母,string:小写字母,int:数字 php程序员站
//$config['length'] = 4; //验证码长度
//$config['interfere']= 10; //干扰线强度,范围为1-30,0或空为不起用干扰线
//$v->init($config); //配置
$v->create();
?>验证码类inc_vcode_class.php: www~phperz~com 以下为引用的内容：
<?php
/**
* 验证码类
* 注:需要gd库支持
*/
session_start();
class vcode{
private $config;
private $im;
private $str;function __construct(){
$this->config['width'] = 50;
$this->config['height'] = 20;
$this->config['vcode'] = "vcode";
$this->config['type'] = "default";
$this->config['length'] = 4;
$this->config['interfere'] = 10;$this->str['default'] = "abcdefghijklmnopqrstuvwxyz";
$this->str['string'] = "abcdefghijklmnopqrstuvwxyz";
$this->str['int'] = "0123456789";
}//配置
public function init($config=array()){
if (!empty($config) && is_array($config)){
foreach($config as $key=>$value){
$this->config[$key] = $value;
}
}
}//输出验证码
public function create(){
if (!function_exists("imagecreate")){
return false;
}
$this->create_do();
}//创建
private function create_do(){
$this->im = imagecreate($this->config['width'],$this->config['height']); php程序员之家
//设置背景为白色
imagecolorallocate($this->im, 255, 255, 255);//为此背景加个边框
$bordercolor= imagecolorallocate($this->im,37,37,37);
imagerectangle($this->im,0,0,$this->config['width']-1,$this->config['height']-1,$bordercolor);//生成验证码
$this->create_str();
$vcode = $_session[$this->config['vcode']];//输入文字
$fontcolor = imagecolorallocate($this->im,46,46,46);
for($i=0;$i<$this->config['length'];$i++){
imagestring($this->im,5,$i*10+6,rand(2,5),$vcode[$i],$fontcolor);
}//加入干扰线
$interfere = $this->config['interfere'];
$interfere = $interfere>30?"30":$interfere; php程序员站
if (!empty($interfere) && $interfere>1){
for($i=1;$i<$interfere;$i++){
$linecolor = imagecolorallocate($this->im,rand(0,255),rand(0,255),rand(0,255));
$x = rand(1,$this->config['width']);
$y = rand(1,$this->config['height']);
$x2 = rand($x-10,$x+10);
$y2 = rand($y-10,$y+10);
imageline($this->im,$x,$y,$x2,$y2,$linecolor);
}
}header("pragma:no-cachern");
header("cache-control:no-cachern");
header("expires:0rn");
header("content-type:image/jpegrn");
imagejpeg($this->im);
imagedestroy($this->im);
exit;
}//得到验证码
private function create_str(){
if ($this->config['type']=="int"){
for($i=1;$i<=$this->config['length'];$i++){
$vcode .= rand(0,9);
}
$_session[$this->config['vcode']] = $vcode;
return true;
}
$len = strlen($this->str[$this->config['type']]);
if (!$len){
$this->config['type'] = "default";
$this->create_str();
}
for($i=1;$i<=$this->config['length'];$i++){
$offset = rand(0,$len-1);
$vcode .= substr($this->str[$this->config['type']],$offset,1);
}
$_session[$this->config['vcode']] = $vcode;
return true;
}
}
PHP之友评论