php自定义验证码图片大小且可点击图片刷新验证码-白红宇

php自定义验证码图片大小且可点击图片刷新验证码

阅读量：4323 次

发布时间：2019-06-06

本文共 2148 字，大约阅读时间需要 7 分钟。

<?php

class ValidateCode{

public $charset="abcdefghjkmnpqrstwxyzABCDEFGHJKLMNPQRSTWXYZ23456789";

public $codelength=9;//验证码长度

public $code;//验证码

public $img;//画布

public $width;

public $height;

public $fontttf='SIMSUN.TTC';//字体可从C:\WINDOWS\Fonts下复制

public $fontSize=40;

//生成随机验证码

public function createCode(){

$length=strlen($this->charset);

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

$this->code.=$this->charset[mt_rand(0,$length-1)];

}

return $this->code;

}

//创建画布

public function createBg(){

header('Content-Type:image/png');

$this->img=imagecreatetruecolor($this->width,$this->height);

$white=imagecolorallocate($this->img, 255, 255, 255);

//填充背景（白色）

imagefill($this->img, 0, 0, $white);

//干扰线

for($i=0;$i<6;$i++){

$linecolor=imagecolorallocate($this->img, rand(50, 200), rand(100, 200), rand(150, 200));

imagearc($this->img,mt_rand(-$this->width,$this->width),mt_rand(-$this->height,$this->height),mt_rand(30,$this->width*2),mt_rand(20,$this->height*2),mt_rand(0,360),mt_rand(0,360),$linecolor);

}

//干扰点

for($i=0;$i<100;$i++){

$charcolor=imagecolorallocate($this->img, rand(200, 250), rand(200, 250), rand(200, 250));

imagechar($this->img, $this->fontSize, rand(0,$this->width), rand(0,$this->height), '*', $charcolor);

}

//验证码插入图片

imagefttext($this->img, $this->fontSize, 0, 4, $this->fontSize+3, imagecolorallocate($this->img, rand(0, 100), rand(0, 150), rand(0, 200)), $this->fontttf,$this->code);

imagepng($this->img);

imagedestroy($this->img);

}

//返回验证码

public function getCode(){

return $this->code;

}

//验证函数

public function checkCode(){

!$this->width && $this->width= $this->codelength*$this->fontSize*4/5 +5;

!$this->height && $this->height=$this->fontSize+10;

$this->createCode();