PHP production graphic verification code code sharing, php graphic verification code code_PHP tutorial

PHP graphic verification code code sharing, PHP graphic verification code code

Effect:

myvcode.class.php: Encapsulates the class for creating verification codes

<&#63;php<br />/*<br />* file:myvcode.class.php<br />* 验证码类,类名Vcode<br />*/<br />class Vcode<br />{<br />private $width;              /*验证码宽度*/<br />private $height;             /*验证码高度*/<br />private $codeNum;            /*验证码字符个数*/<br />private $checkCode;            /*验证码字符*/<br />private $image;                /*验证码资源*/<br />private $pixNum;            /*绘制干扰点的个数*/<br />private $lineNum;            /*绘制干扰线的条数*/

/*<br />*构造方法实例化验证码对象，并初始化数据<br />*@param int $width         设置默认宽度<br />*@param int $height     设置默认高度<br />*@param int $codeNum    设置验证码中的字符个数<br />*@param int $pixNum        设置干扰点的个数<br />*@param int $lineNum    设置干扰线的数量<br />*/<br />function __construct($width=80,$height=40,$codeNum=4,$pixNum=40,$lineNum=5)<br />{<br />$this->width = $width;<br>$this->height = $height;<br>$this->codeNum = $codeNum;<br>$this->pixNum = $pixNum;<br>$this->lineNum = $lineNum;<br>}<br>/*内部私有方法,创建图像资源*/<br>private function getCreateImage()<br>{<br>$this->image = imagecreatetruecolor($this->width, $this->height);<br>$white = imagecolorallocate($this->image,0xff,0xff,0xff);<br>imagefill($this->image, 0, 0, $white);<br>$black = imagecolorallocate($this->image,0,0,0);<br>imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $black);<br>}<br>/*内部私有方法,绘制字符，去掉o0Llz和012*/<br>private function createCheckCode()<br>{<br>$code = '3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKMNPQRSTUVWXY';<br>$this->checkCode = "";<br>for($i=0; $i<$this->codeNum;$i++)<br>{<br>$char = $code{rand(0,strlen($code) - 1)};<br>$this->checkCode .= $char;<br>$fontColor = imagecolorallocate($this->image, rand(0,128), rand(0,128),rand(0,128));<br>$fontSize = rand(3,5);<br>$x = rand(0,$this->width-imagefontwidth($fontSize));<br>$y = rand(0,$this->height-imagefontheight($fontSize));<br>imagechar($this->image, $fontSize, $x, $y, $char, $fontColor);<br>}<br>}<br>/*内部私有方法设置干扰元素*/<br>private function setDisturbColor()<br>{<br>/*绘制干扰点*/<br>for($i=0; $i<$this->pixNum; $i++)<br>{<br>$color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));<br>imagesetpixel($this->image, rand(1,$this->width-2), rand(1,$this->height-2), $color);<br>}<br>/*绘制干扰线*/<br>for($i=0; $i<$this->lineNum; $i++)<br>{<br>$color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));<br>imageline($this->image, rand(1,$this->width / 2), rand(1,$this->height / 2),<br>rand($this->width / 2,$this->width – 2), rand($this->height / 2,$this->height – 2), $color);

}<br>}<br>/*开启session保存 利用echo 输出图像*/<br>function __toString()<br>{<br>$_SESSION['code'] = strtoupper($this->checkCode);<br>$this->getCreateImage();<br>$this->createCheckCode();<br>$this->setDisturbColor();<br>$this->outputImg();<br>}<br>/*内部私有方法输出图像*/<br>private function outputImg()<br>{<br>header("content-type:image/png");<br>imagepng($this->image);<br>}<br>/*析构方法，释放对象*/<br>function __destruct()<br>{<br>imagedestroy($this->image);<br>}<br>}<br>?>

imgcode.php output image

<&#63;php
session_start();
require_once('myvcode.class.php');
echo new Vcode();
&#63;>

test.html: Same as img tag reference

<img src="imgcode.php">

You can add an a tag and use js to achieve the effect of changing one picture:

/*Partial refresh to change verification code*/
function changeCode()
{
var imgcode = document.getElementById(‘code’);
var change = document.getElementById(‘change’);
change.onclick = function()
{
/*You must add the following parameters to refresh*/
imgcode.src='code.php?tm'+Math.random();
}
}

code and change are the ids of img and a respectively

PHP image verification code

This is the verification code of phpcms. It has been used on hundreds of thousands of websites and is very easy to use.

session_start();

$enablegd = 1;
//Determine whether the image processing function exists
$funcs = array('imagecreatetruecolor','imagecolorallocate','imagefill','imagestring','imageline','imagerotate','imagedestroy','imagecolorallocatealpha' ,'imageellipse','imagepng');
foreach($funcs as $func)
{
if(!function_exists($func))
{
$enablegd = 0;
break;
}
}

ob_clean(); //Clean buffer

if($enablegd)
{
//create captcha
$consts = 'cdfgkmnpqrstwxyz23456';
$vowels = 'aek23456789';
for ($x = 0; $x < 6; $x++)
{
$const[$x] = substr($consts, mt_rand(0,strlen($consts)-1),1); //Get a random number in $consts
$vow[$x] = substr($vowels, mt_rand(0 ,strlen($vowels)-1),1); //Get a random number in $vowels
}
$radomstring = $const[0] . $vow[0] .$const[2] . $const[1] . $vow[1] . $const[3] . $vow[3] . $const[4];
$_SESSION['checkcode'] = $string = substr($radomstring, 0,4); //Display 4 characters

$imageX = strlen($radomstring)*8; //Width of the image
$imageY = 20; //Height of the image
$ im = imagecreatetruecolor($imageX,$imageY); //Create a new true color image

//creates two variables to store color
$background = imagecolorallocate($im, rand(180, 250), rand(180, 250), rand(180, 250)); //Background color
$foregroundArr = array(imagecolorallocate($im, rand(0, 20), rand(0, 20), rand(0, 20)),
imagecolorallocate($im, rand(0, 20), rand(0, 10), rand(245, 255)),
imagecolorallocate($im, rand(245, .... ..The rest of the full text>>

After inserting the PHP image verification code, write a judgment code when submitting? ?

action.php

session_start();
$password = md5(trim($_POST['password']));
$str_reg=$_POST ['number']; //Verification code filled in by the user
$str_reg = strtoupper($str_reg); //Convert to uppercase

if ($str_reg !=$_SESSION['yzm'] or empty ($str_reg) )
{echo "Verification code error";
}
else
{
$_SESSION['yzm']=""; //Clear session
… …
Execute database query operation, verify username and password
}
?>

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