How to implement simple Chinese verification code function in php

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

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 src="/static/imghwm/default1.png"  data-src="img.php"  class="lazy"  alt="" ><br/>
  <input type="text" name="check"><br/>
  <input type="submit" value="提交">
</form>

The running effect is as follows:

The above is the entire content of this article, I hope it will be helpful to everyone's study.

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