133 lines
3.7 KiB
PHP
133 lines
3.7 KiB
PHP
<?php namespace Phpcmf\Library;
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/**
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* https://www.besyun.com
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* BESCMS
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* 本文件是框架系统文件，二次开发时不可以修改本文件，可以通过继承类方法来重写此文件
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**/
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/**
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* 验证码类
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*/
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class Captcha {
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private $code;
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private $charset = 'adehkmnprswyADEFGHKMNPRSTVWY683457'; //设置随机生成因子
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private $width;
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private $height;
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private $img;
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private $font;
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private $fontsize = 16;
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private $fontcolor;
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private $randstring = ['*', '@', '$', '%', '&', '!'];
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public function __construct() {
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if (function_exists('my_captcha_ttf()')) {
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$this->font = my_captcha_ttf();
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} else {
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$this->font = WRITEPATH.'captcha.ttf';
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if (!is_file($this->font)) {
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// 加载老版本的字体文件
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$this->font = CONFIGPATH.'font/1.ttf';
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if (!is_file($this->font)) {
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log_message('error', '验证码字体文件（'.WRITEPATH.'captcha.ttf）不存在，可能无法生成验证码');
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}
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}
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}
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}
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// todo
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public function create($width = 120, $height = 32) {
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$this->_code();
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$this->width = min(200, $width > 0 ? abs((int)$width) : 120);
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$this->height = min(100, $height > 0 ? abs((int)$height) : 32);
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$this->_bg();
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$this->_line();
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$this->_font();
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$this->_show();
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return $this->code;
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}
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//生成随机验证码
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private function _code() {
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if ($this->code) {
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return $this->code;
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}
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$code = '';
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$charset_len = strlen($this->charset) - 1;
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for ($i = 0; $i < 4; $i++) {
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$code.= $this->charset[rand(1, $charset_len)];
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}
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$this->code = trim($code);
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}
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//生成背景
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private function _bg() {
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$this->img = imagecreatetruecolor($this->width, $this->height);
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$color = imagecolorallocate($this->img,255,255,255);
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imagecolortransparent($this->img, $color);
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imagefill($this->img,0,0, $color);
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}
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//生成文字
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private function _font() {
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$_x = $this->width / 4;
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$this->fontcolor = imagecolorallocate($this->img, mt_rand(0,180), mt_rand(0,180), mt_rand(0,180));
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for ($i=0; $i<4; $i++) {
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imagettftext(
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$this->img,
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$this->fontsize,
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mt_rand(-30,30),
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intval($_x*$i+mt_rand(1,5)),
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intval($this->height / 1.4),
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$this->fontcolor,
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$this->font,
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$this->code[$i]
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);
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}
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}
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//生成干扰线条
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private function _line() {
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for ($i=0;$i<5;$i++) {
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$color = imagecolorallocate($this->img, mt_rand(0,180), mt_rand(0,180), mt_rand(0,180));
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imageline(
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$this->img,
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mt_rand(0,$this->width),
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mt_rand(0,$this->height),
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mt_rand(0,$this->width),
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mt_rand(0,$this->height),
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$color
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);
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}
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for ($i=0;$i<30;$i++) {
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$color = imagecolorallocate($this->img, mt_rand(100,255), mt_rand(100,255), mt_rand(100,255));
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imagestring(
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$this->img,
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mt_rand(1,5),
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mt_rand(0,$this->width),
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mt_rand(0,$this->height),
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$this->randstring[rand(0, 5)],
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$color
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);
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}
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}
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//显示
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private function _show() {
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@ob_start();
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@ob_clean(); //关键代码，防止出现'图像因其本身有错无法显示'的问题。
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header('Content-type:image/png');
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imagepng($this->img);
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imagedestroy($this->img);
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}
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}
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