PHP中验证码类及使用方法

备注:将公共页面加入ssion_start();

<?php

ssion_start();

ini_t(‘display_errors’, ‘off’);

class ccheckcodefile

{

//验证码位数 www.2cto.com

var $mcheckcodenum = 4;

//产生的验证码

var $mcheckcode = ”;

//验证码的图片

var $mcheckimage = ”;

//干扰像素

var $mdisturbcolor = ”;

//验证码的图片宽度

var $mcheckimagewidth = ’80’;

//验证码的图片宽度

var $mcheckimageheight = ’20’;

//输出头

function outfileheader()

{

header (“content-type: image/png”);

}

//产生验证码

function createcheckcode()

{

//$this->mcheckcode = strtoupper(substr(md5(rand()),0,$this->mcheckcodenum));

$this->mcheckcode = strtoupper(substr(rand(0,9999999999),0,$this->mcheckcodenum));

ssion_cache_expire(60);

ssion_start();

$_ssion[“code_str”] = $this->mcheckcode;

return $this->mcheckcode;

}

//产生验证码图片

function createimage()

{

$this->mcheckimage = @imagecreate ($this->mcheckimagewidth,$this->mcheckimageheight);

imagecolorallocate ($this->mcheckimage, 255, 255, 255);

return $this->mcheckimage;

}

//设置图片的干扰像素

function tdisturbcolor()

{

for ($i=0;$i<=128;$i++)

{

$this->mdisturbcolor = imagecolorallocate ($this->mcheckimage, rand(0,255), rand(0,255), rand(0,255));

imagetpixel($this->mcheckimage,rand(1,100),rand(1,100),$this->mdisturbcolor);

}

}

//设置验证码图片的大小\宽\高

function tcheckimagewh($width,$height)

{

if($width==”||$height==”)return fal;

$this->mcheckimagewidth = $width;

$this->mcheckimageheight = $height;

return true;

}

//在验证码图片上逐个画上验证码

function writecheckcodetoimage()

{

for ($i=0;$i<=$this->mcheckcodenum;$i++)

{

$bg_color = imagecolorallocate ($this->mcheckimage, rand(0,255), rand(0,255), rand(0,255));

$x = floor($this->mcheckimagewidth/$this->mcheckcodenum)*$i;

$y = rand(0,$this->mcheckimageheight-15);

imagechar ($this->胜利者英文;mcheckimage, 5, $x, $y, $this->mcheckcode[$i], $bg_color);

}

}

//输出验证码图片

function outcheckimage()

{

$this ->outfileheader();

刨根问底的近义词 $this ->createcheckcode();

$this ->createimage();

$this ->tdisturbcolor();

$this ->writecheckcodetoimage();

imagepng($this->mcheckimage);

imagedestroy($this->mcheckimage);

}

}

$c_check_code_image = new ccheckcodefile();

//$c_check_code_image ->tcheckimagewh(100,50);//设置显示验证码图片的尺寸

$c_check_code_image->outcheckimage();

?>

使用方法:

<tr>

<td alig少先队什么时候改为少年先锋队n=”center” valign=”middle”>验证码</td>

<td align=”center” valign=”middle”><input name=”number” type=”text” style=”width:80px;”>

<img src=”code.php” id=”yzm” onclick=”this.src=’code.php?abc=’+math.random()” alt=”图片看不清？点击重新得到验证码” style=”cursor:hand;” />

</td>

</tr>

验证是否正确

ssion_start();

if($_post[“number”] == $_ssion[“code_str”]){

// echo(“验证码正确”);

}el{

echo “

<script>

var s=10;

function ok()

{

s–;

document.getelementbyid(‘tips’).innerhtml=s;

if(s==0)

{

cleartimeout(t);

history.go(-1);

}

}

var t=tinterval(‘ok()’,1000);

</script>

” . “请输入的验证码,请重新输入<span id=’tips’></span>秒之后，将为您跳转到<a href=\”javascript:history.go(-1)\”>上一页</a>”;

}

摘自 https://itsafe.org/?p=384