<?php
// 摘自: FLEA_Helper_ImgCode
class xser_helper_imgcode {
private $_code ; // 生成的验证码
private $_expired ; // 验证码过期时间
private $imagetype = 'jpeg'; // 验证码图片的类型（默认为 jpeg）
/**
* 指示是否在生成验证码图片时保留已有的验证码
*
* 保留已有的验证码可以让用户在各个不同的页面都看到一致的验证码。
* 只有这个验证码使用后，已有的验证码才会失效。
*
* @var boolean
*/
private $keepCode = false;
private $code_key = 'x_i_c' ,$expired_key = 'x_i_c_expired';
public function __construct($key=''){
@session_start();
$this->code_key .= "_{$key}" ;
$this->expired_key .= "_{$key}" ;
$this->_code = isset($_SESSION[$this->code_key])?$_SESSION[$this->code_key]:'';
$this->_expired = isset($_SESSION[$this->expired_key])?$_SESSION[$this->expired_key]:0;
}
/**
* 检查图像验证码是否有效
* @param string $code
* @return boolean
*/
public function check($code)
{
if (time()>=$this->_expired || strtoupper($code)!=strtoupper($this->_code))
return false;
return true;
}
/**
* 检查图像验证码是否有效（区分大小写）
* @param string $code
* @return boolean
*/
function checkCaseSensitive($code)
{
if (time()>=$this->_expired || $code!=$this->_code)
return false;
return true;
}
/**
* 清除 session 中的 imgcode 相关信息
*/
function clear()
{
unset($_SESSION[$this->code_key]);unset($_SESSION[$this->expired_key]);
}
/**
* 利用 GD 库产生验证码图像
*
* 目前 $options 参数支持下列选项：
* - paddingLeft, paddingRight, paddingTop, paddingBottom
* - border, borderColor
* - font, color, bgcolor
*
* 如果 font 为 0-5，则使用 GD 库内置的字体。
* 如果要指定字体文件，则 font 选项必须为字体文件的绝对路径，例如：
* <code>
* $options = array('font' => '/var/www/example/myfont.gdf');
* image($type, $length, $lefttime, $options);
* </code>
*
* @param int $type 验证码包含的字符类型，0 - 数字、1 - 字母、其他值 - 数字和字母
* @param int $length 验证码长度
* @param int $leftime 验证码有效时间（秒）
* @param array $options 附加选项，可以指定字体、宽度和高度等参数
*/
function image($type = 0, $length = 4, $lefttime = 900, $options = null)
{
if ($this->keepCode && $this->_code != '') {
$code = $this->_code;
} else {
// 生成验证码
switch ($type) {
case 0:
$seed = '0123456789';
break;
case 1:
$seed = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
break;
default:
$seed = '346789ABCDEFGHJKLMNPQRTUVWXYabcdefghjklmnpqrtuvwxy';
}
if ($length <= 0) { $length = 4; }
$code = '';
list($usec, $sec) = explode(" ", microtime());
srand($sec + $usec * 100000);
$len = strlen($seed) - 1;
for ($i = 0; $i < $length; $i++) {
$code .= substr($seed, rand(0, $len), 1);
}
$_SESSION['x_i_c'] = $code;
}
$_SESSION['x_i_c_expired'] = time() + $lefttime;
// 设置选项
$paddingLeft = isset($options['paddingLeft']) ?
(int)$options['paddingLeft'] : 3;
$paddingRight = isset($options['paddingRight']) ?
(int)$options['paddingRight'] : 3;
$paddingTop = isset($options['paddingTop']) ?
(int)$options['paddingTop'] : 2;
$paddingBottom = isset($options['paddingBottom']) ?
(int)$options['paddingBottom'] : 2;
$color = isset($options['color']) ? $options['color'] : '0xffffff';
$bgcolor = isset($options['bgcolor']) ? $options['bgcolor'] : '0x666666';
$border = isset($options['border']) ? (int)$options['border'] : 1;
$bdColor = isset($options['borderColor']) ? $options['borderColor'] : '0x000000';
// 确定要使用的字体
if (!isset($options['font'])) {
$font = 5;
} else if (is_int($options['font'])) {
$font = (int)$options['font'];
if ($font < 0 || $font > 5) { $font = 5; }
} else {
$font = imageloadfont($options['font']);
}
// 确定字体宽度和高度
$fontWidth = imagefontwidth($font);
$fontHeight = imagefontheight($font);
// 确定图像的宽度和高度
$width = $fontWidth * strlen($code) + $paddingLeft + $paddingRight +
$border * 2 + 1;
$height = $fontHeight + $paddingTop + $paddingBottom + $border * 2 + 1;
// 创建图像
$img = imagecreate($width, $height);
// 绘制边框
if ($border) {
list($r, $g, $b) = $this->_hex2rgb($bdColor);
$borderColor = imagecolorallocate($img, $r, $g, $b);
imagefilledrectangle($img, 0, 0, $width, $height, $borderColor);
}
// 绘制背景
list($r, $g, $b) = $this->_hex2rgb($bgcolor);
$backgroundColor = imagecolorallocate($img, $r, $g, $b);
imagefilledrectangle($img, $border, $border,
$width - $border - 1, $height - $border - 1, $backgroundColor);
// 绘制文字
list($r, $g, $b) = $this->_hex2rgb($color);
$textColor = imagecolorallocate($img, $r, $g, $b);
imagestring($img, $font, $paddingLeft + $border, $paddingTop + $border,
$code, $textColor);
// 输出图像
switch (strtolower($this->imagetype)) {
case 'png':
header("Content-type: " . image_type_to_mime_type(IMAGETYPE_PNG));
imagepng($img);
break;
case 'gif':
header("Content-type: " . image_type_to_mime_type(IMAGETYPE_GIF));
imagegif($img);
break;
case 'jpg':
default:
header("Content-type: " . image_type_to_mime_type(IMAGETYPE_JPEG));
imagejpeg($img);
}
imagedestroy($img);
unset($img);
}
/**
* 将 16 进制颜色值转换为 rgb 值
*
* @param string $hex
*
* @return array
*/
private function _hex2rgb($color, $defualt = 'ffffff')
{
$color = strtolower($color);
if (substr($color, 0, 2) == '0x') {
$color = substr($color, 2);
} elseif (substr($color, 0, 1) == '#') {
$color = substr($color, 1);
}
$l = strlen($color);
if ($l == 3) {
$r = hexdec(substr($color, 0, 1));
$g = hexdec(substr($color, 1, 1));
$b = hexdec(substr($color, 2, 1));
return array($r, $g, $b);
} elseif ($l != 6) {
$color = $defualt;
}
$r = hexdec(substr($color, 0, 2));
$g = hexdec(substr($color, 2, 2));
$b = hexdec(substr($color, 4, 2));
return array($r, $g, $b);
}
}
demo:
/**
* @return xser_helper_imgcode
*/
private function imgcode_instance(){
xser::loadhelper('imgcode');
if (!xser::is_register('admin_imgcode'))
return xser::register(new xser_helper_imgcode('admin'),'admin_imgcode');
return xser::singleton_alias('admin_imgcode');
}
public function actionImgcode(){
// 生成注册码
$this->imgcode_instance()->image(0,4,900,array(
'border' => '0' ,'bgcolor' => '#d4d0c8' ,'color' => '#666666' ,
'paddingTop' => '1' ,'paddingBottom' => '1'
));
}
转载请注明原文地址: https://ju.6miu.com/read-1125804.html
