PHP implementation of generating verification code example sharing PHP verification code video PHP verification verification code PHP verification code recognition

image.func.php

<&#63;php
require_once('string.func.php');

 function verifyImage( $type=1,$length=4,$pixel=0,$line=0,$sess_name="verify"){

  session_start();
  /*定义长度和宽度*/
$width=80;
$height=30;
/* 创建画布*/
$image=imagecreatetruecolor($width, $height);

/*本函数用来匹配图形的颜色，供其它绘图函数使用。参数 image 表示图形的 handle。参数 red、green、blue 是色彩三原色，其值从 0 至 255....我在此定义黑色和白色*/
$white=imagecolorallocate($image, 255, 255, 255);
$black=imagecolorallocate($image,0,0,0);

/*本函数将图片的封闭长方形区域着色。参数 x1、y1 及 x2、y2 分别为矩形对角线的坐标。参数 col 表示欲涂上的颜色*/
imagefilledrectangle($image, 1, 1, $width-2, $height-2, $white);

/*buildRandomString函数用来生成一个验证码*/
$chars=buildRandomString($type,$length);

/*将验证码给session以便用来判断用户输入是否正确*/
$_SESSION[$sess_name]=$chars;

/*定义字体库*/
$f


/*用循环来将验证码一个一个的写入图片中*/
for($i=0;$i<$length;$i++)
{
  $size=mt_rand(14,18);
  $angle=mt_rand(-15,15);

  /*验证码的横坐标与纵坐标*/
  $x=5+$i*$size;
  $y=mt_rand(20,26);

  $color=imagecolorallocate($image,mt_rand(50,190),mt_rand(50,200),mt_rand(50,90));
  $f><pre class="brush:php;toolbar:false"><&#63;php

function buildRandomString($type=1,$length=4){

if($type==1)
{
  /*join函数把数组转换为字符串。。join() 函数是 implode() 函数的别名*/
  $chars=join("",range(0,9));
}elseif ($type==2) {
  /*array_merge函数合并数组*/
  $chars=join("",array_merge(range("a","z"),range("A","Z")));
}elseif($type==3)
{
  $chars=join("",array_merge(range("a","z"),range("A","Z"),range(0,9)));
}

if($length>strlen($chars))
{
  exit("字符串长度不够");
}
/*打乱字符串*/
$chars=str_shuffle($chars);
return substr($chars,0,$length);

}
 ?>

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