75 lines
2.7 KiB
PHP
75 lines
2.7 KiB
PHP
<?php
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//验证码类
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class ValidateCode {
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private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789'; //随机因子
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private $code; //验证码
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private $codelen = 4; //验证码长度
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private $width = 130; //宽度
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private $height = 50; //高度
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private $img; //图形资源句柄
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private $font; //指定的字体
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private $fontsize = 20; //指定字体大小
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private $fontcolor; //指定字体颜色
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//构造方法初始化
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public function __construct() {
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$this->font = ROOT_PATH.'/../assets/font/elephant.ttf';
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}
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//生成随机码
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private function createCode() {
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$_len = strlen($this->charset)-1;
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for ($i=0;$i<$this->codelen;$i++) {
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$this->code .= $this->charset[mt_rand(0,$_len)];
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}
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}
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//生成背景
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private function createBg() {
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$this->img = imagecreatetruecolor($this->width, $this->height);
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$color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
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imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color);
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}
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//生成文字
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private function createFont() {
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$_x = $this->width / $this->codelen;
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for ($i=0;$i<$this->codelen;$i++) {
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$this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
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imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,$this->code[$i]);
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}
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}
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//生成线条、雪花
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private function createLine() {
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for ($i=0;$i<6;$i++) {
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$color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
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imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color);
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}
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for ($i=0;$i<100;$i++) {
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$color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
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imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);
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}
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}
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//输出
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private function outPut() {
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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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//对外生成
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public function doimg() {
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$this->createBg();
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$this->createCode();
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$this->createLine();
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$this->createFont();
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$this->outPut();
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}
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//获取验证码
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public function getCode() {
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return strtolower($this->code);
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}
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} |