Home >Backend Development >PHP Problem >What should I do if the php verification code remains unchanged?
What should I do if the php verification code remains unchanged?
- 藏色散人Original
- 2021-10-25 09:17:152028browse
Solutions to keep the PHP verification code unchanged: 1. Use the "javascript:ckimg();" method to change a verification code; 2. Use "οnclick="this.src='..." The method is to click to change the picture.
The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer
What should I do if the php verification code remains unchanged?
php verification code changes without refreshing (replacement)
test.php
<html>
<head>
<script>
function ckimg(){
document.getElementById('img').src="validateCode2.php?"+new Date().getTime();
}
</script>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title></title>
</head>
<body>
<!--第一种方法-->
<a href="javascript:ckimg();" title="更换一张验证码图片"><img src="validateCode2.php" id="img" alt="看不清，请换一张" /></a> <a href="javascript:ckimg();" title="更换一张验证码图片">看不清，请换一张</a>
<!--第二种方法-->
<img src="validateCode2.php" alt="看不清，点击换图片" id="img" οnclick="this.src='validateCode2.php?'+new Date().getTime();" style='cursor:pointer;'>
</body>
</html>
Production verification The code class contains some parameters for verification code generation, such as: size, color, symbol type for displaying verification code
validateCode2.php
<?php
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();
?>
Recommended study: "PHP video tutorial》
The above is the detailed content of What should I do if the php verification code remains unchanged?. For more information, please follow other related articles on the PHP Chinese website!
Statement：
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Previous article：How to convert array to url string in phpNext article：How to convert array to url string in php