Home >Backend Development >PHP Tutorial >Example of simple Chinese verification code function implemented in PHP

Example of simple Chinese verification code function implemented in PHP

不言
不言Original
2018-04-26 14:17:311667browse

This article mainly introduces the simple Chinese verification code function implemented by PHP. It analyzes the implementation steps and operation methods of PHP Chinese verification code function in the form of examples, including graphic creation, coding operations, session operations and other related skills. Required Friends can refer to

. This article describes the simple Chinese verification code function implemented in PHP. Share it with everyone for your reference, the details are as follows:

img.php

<?php
session_start();
/*for($i=0;$i<4;$i++) {
  $rand .= dechex(rand(1,15));
}
$_SESSION[check_pic] = $rand;
*/
$image = imagecreatetruecolor(100, 30);
$bg = imagecolorallocate($image, 0, 0, 0);
$color = imagecolorallocate($image, 255, 255, 255);
//imagestring($image, rand(1,6), rand(3,60), rand(3,15), $rand, $color);
for($i=0;$i<3;$i++) {
  $color2 = imagecolorallocate($image, rand(0,255), rand(0,255),rand(0,255));
  imageline($image, rand(0,100), 0, 100, 30, $color2);
}
//rand() ---->0-max 不大于100
for($i=0;$i<200;$i++) {
  imagesetpixel($image, rand()%100, rand()%30, $color2);
}
//$str = iconv("gbk", "utf-8", "中");
$str = "中国";
$_SESSION[check_pic] = $str;
//解决中文,页面本身为utf-8
$str = mb_convert_encoding($str, "html-entities","utf-8" );
//2:字体大小 3:倾斜角度 x , y 坐标
imagettftext($image, 12, 0, 20, 20, $color, &#39;MSYH.TTF&#39;, $str);
//输出图片
header("Content-type: image/jpeg;charset=utf-8");
imagejpeg($image);
/*修改eclipse的配置,可以使得eclipse的新建项目的默认编码直接为UTF-8
在菜单栏的
Window->Preferences->General->Workspace->Text file encoding
将其改为UFT-8即可。*/
?>

sub.php

<?php
  header("Content-type: text/html;charset=utf-8");
  session_start();
  if($_POST[check]) {
    if($_POST[check]==$_SESSION[check_pic]) {
      echo "验证码正确:".$_SESSION[check_pic];
    } else {
      echo "验证码错误:".$_SESSION[check_pic];
    }
  }
?>
<form action="" method="post">
  <img alt="" src="img.php"><br/>
  <input type="text" name="check"><br/>
  <input type="submit" value="提交">
</form>

The running effect diagram is as follows:

Related recommendations:

PHP implementation of shopping website


The above is the detailed content of Example of simple Chinese verification code function implemented in PHP. 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