php生成验证码类代码
<?php
class securecode {
private static $instance = null;
private $code = '';
private $fontfile;
private $validate;
private $image;
private $specialadd = 'special string for securecode';
private $codeexpire = 86400;
private $codecookiename = 'secure_code';
/**
* 构造方法
*/
private function securecode() {
$this->fontfile = dirname(__file__) . '/arial.ttf';
}
private function __construct() {
$this->securecode();
}
public static function getinstance() {
if (self::$instance == null) self::$instance = new self();
return self::$instance;
}
/**
* 指定字体文件所在路径，默认为当前文件夹下arial.ttf文件
* @param $fontfile 文件路径
* @return void
*/
function loadfont($fontfile) {
$this->fontfile = $fontfile;
}
/**
* 图片输出方法，在执行本方法前程序不应该有任何形式的输出
* @return void;
*/
function stroke() {
$this->savecode();
self::sendheader();
imagegif($this->validate);
imagedestroy($this->validate);
imagedestroy($this->image);
}
/**
* 图片保存方法
* @param $filename 保存路径
* @return void
*/
function save($filename) {
$this->savecode();
imagegif($this->validate, $filename);
imagedestroy($this->validate);
imagedestroy($this->image);
}
/**
* 验证码验证方法
* @param $input 要验证的字符串，即用户的输入内容
* @return boolean 验证结果
*/
function verify($input) {
$input = strtolower($input);
$targetcode = $this->authcode($input);
$code = $this->getcookie();
if (emptyempty($code) || $code != $targetcode) $result = false;
else $result = true;
$_cookie[$this->codecookiename] = '';
setcookie($this->codecookiename, '', -1);
return $result;
}
/**
* 图片创建方法
* @return void;
*/
function createimage() {
$this->randcode();
$size = 30;
$width = 90;
$height = 35;
$degrees = array(
rand(0, 30) ,
rand(0, 30) ,
rand(0, 30) ,
rand(0, 30)
);
for ($i = 0; $i < 4; ++$i) {
if (rand() % 2);
else $degrees[$i] = - $degrees[$i];
}
$this->image = imagecreatetruecolor($size, $size);
$this->validate = imagecreatetruecolor($width, $height);
$back = imagecolorallocate($this->image, 255, 255, 255);
$border = imagecolorallocate($this->image, 0, 0, 0);
imagefilledrectangle($this->validate, 0, 0, $width, $height, $back);
for ($i = 0; $i < 4; ++$i) {
$temp = self::rgbtohsv(rand(0, 250) , rand(0, 150) , rand(0, 250));
if ($temp[2] > 60) $temp[2] = 60;
$temp = self::hsvtorgb($temp[0], $temp[1], $temp[2]);
$textcolor[$i] = imagecolorallocate($this->image, $temp[0], $temp[1], $temp[2]);
}
for ($i = 0; $i < 200; ++$i) {
$randpixelcolor = imagecolorallocate($this->validate, rand(0, 255) , rand(0, 255) , rand(0, 255));
imagesetpixel($this->validate, rand(1, 87) , rand(1, 35) , $randpixelcolor);
}
$temp = self::rgbtohsv(rand(220, 255) , rand(220, 255) , rand(220, 255));
if ($temp[2] < 200) $temp[2] = 255;
$temp = self::hsvtorgb($temp[0], $temp[1], $temp[2]);
$randlinecolor = imagecolorallocate($this->image, $temp[0], $temp[1], $temp[2]);
self::imagelinethick($this->validate, $textcolor[rand(0, 3) ]);
imagefilledrectangle($this->image, 0, 0, $size, $size, $back);
putenv('gdfontpath=' . realpath('.'));
// name the font to be used (note the lack of the .ttf extension
imagettftext($this->image, 15, 0, 8, 20, $textcolor[0], $this->fontfile, $this->code[0]);
$this->image = imagerotate($this->image, $degrees[0], $back);
imagecolortransparent($this->image, $back);
imagecopymerge($this->validate, $this->image, 1, 4, 4, 5, imagesx($this->image) - 10, imagesy($this->image) - 10, 100);
$this->image = imagecreatetruecolor($size, $size);
imagefilledrectangle($this->image, 0, 0, $size, $size, $back);
imagettftext($this->image, 15, 0, 8, 20, $textcolor[1], $this->fontfile, $this->code[1]);
$this->image = imagerotate($this->image, $degrees[1], $back);
imagecolortransparent($this->image, $back);
imagecopymerge($this->validate, $this->image, 21, 4, 4, 5, imagesx($this->image) - 10, imagesy($this->image) - 10, 100);
$this->image = imagecreatetruecolor($size, $size);
imagefilledrectangle($this->image, 0, 0, $size - 1, $size - 1, $back);
imagettftext($this->image, 15, 0, 8, 20, $textcolor[2], $this->fontfile, $this->code[2]);
$this->image = imagerotate($this->image, $degrees[2], $back);
imagecolortransparent($this->image, $back);
imagecopymerge($this->validate, $this->image, 41, 4, 4, 5, imagesx($this->image) - 10, imagesy($this->image) - 10, 100);
$this->image = imagecreatetruecolor($size, $size);
imagefilledrectangle($this->image, 0, 0, $size - 1, $size - 1, $back);
imagettftext($this->image, 15, 0, 8, 20, $textcolor[3], $this->fontfile, $this->code[3]);
$this->image = imagerotate($this->image, $degrees[3], $back);
imagecolortransparent($this->image, $back);
imagecopymerge($this->validate, $this->image, 61, 4, 4, 5, imagesx($this->image) - 10, imagesy($this->image) - 10, 100);
imagerectangle($this->validate, 0, 0, $width - 1, $height - 1, $border);
}
/**
* 获取随机生成的验证码
* @return string 随机验证码，返回的验证码不进行任何处理
*/
function getcode() {
return $this->code;
}
/**
* 生成随机码方法
* @return void;
*/
protected function randcode() {
$alphastr = 'abcdefghijklmnpqrstuvwxyz123456789';
$randstr = array(
$alphastr{rand(0, 33) },
$alphastr{rand(0, 33) },
$alphastr{rand(0, 33) },
$alphastr{rand(0, 33) }
);
$this->code = strtolower($randstr[0] . $randstr[1] . $randstr[2] . $randstr[3]);
}
/**
* rgb色到hsv色转变方法
* @param $r
* @param $g
* @param $b
* @return array hsv数组
*/
protected static function rgbtohsv($r, $g, $b) {
$tmp = min($r, $g);
$min = min($tmp, $b);
$tmp = max($r, $g);
$max = max($tmp, $b);
$v = $max;
$delta = $max - $min;
if ($max != 0) $s = $delta / $max; // s
else {
$s = 0;
//$h = undefinedcolor;
return;
}
if ($r == $max) $h = ($g - $b) / $delta; // between yellow & magenta
else if ($g == $max) $h = 2 + ($b - $r) / $delta; // between cyan & yellow
else $h = 4 + ($r - $g) / $delta; // between magenta & cyan
$h*= 60; // degrees
if ($h < 0) $h+= 360;
return array(
$h,
$s,
$v
);
}
/**
* 同上一方法功能相反
* @param $h
* @param $s
* @param $v
* @return array rgb数组
*/
protected static function hsvtorgb($h, $s, $v) {
if ($s == 0) {
// achromatic (grey)
$r = $g = $b = $v;
return;
}
$h/= 60; // sector 0 to 5
$i = floor($h);
$f = $h - $i; // factorial part of h
$p = $v * (1 - $s);
$q = $v * (1 - $s * $f);
$t = $v * (1 - $s * (1 - $f));
switch ($i) {
case 0:
$r = $v;
$g = $t;
$b = $p;
break;
case 1:
$r = $q;
$g = $v;
$b = $p;
break;
case 2:
$r = $p;
$g = $v;
$b = $t;
break;
case 3:
$r = $p;
$g = $q;
$b = $v;
break;
case 4:
$r = $t;
$g = $p;
$b = $v;
break;
default: // case 5:
$r = $v;
$g = $p;
$b = $q;
break;
}
return array(
$r,
$g,
$b
);
}
/**
* 使用cookie保存验证码的方法
* @return void
*/
protected function savecode() {
$code = $this->authcode($this->code);
$this->setcookie($code);
}
/**
* 验证码cookie值获取方法
* @return string cookie值
*/
protected function getcookie() {
if (emptyempty($_cookie[$this->codecookiename])) {
return '';
} else {
return addslashes($_cookie[$this->codecookiename]);
}
}
/**
* 验证码cookie创建方法
* @param string $code 要保存的验证码
* @return void
*/
protected function setcookie($code) {
$expire = $this->codeexpire > 0 ? $this->codeexpire + time() : 0;
setcookie($this->codecookiename, $code, $expire);
}
/**
* 验证码加密方法
* @param string $code 要加密的随机码
* @return mixed 执行结果
*/
protected function authcode($code) {
return md5($code . $this->specialadd);
}
/**
* 干扰线生成方法
* @param resource $image 图片资源句柄
* @param string $color 干扰线颜色
*/
protected static function imagelinethick($image, $color) {
$k = rand(5, 20);
for ($px = 0; $px < 400; $px = $px + 1) {
$y = $k * sin(0.1 * ($px)); //$y=200+10*sin(0.1*($px-200));
for ($i = 0; $i < 2; $i++) {
imagesetpixel($image, $px, $y + 10 + $i, $color);
}
}
}
/**
* http标头设置方法
* @return void
*/
protected static function sendheader() {
header("pragma: no-cache");
header("cache-control: max-age=1, s-maxage=1, no-cache, must-revalidate");
header('content-type: image/gif');
}
}本文地址：http://www.phprm.com/tuxiang/fs4443.html
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