<?php namespace App\Tool\Validate; //验证码类 class ValidateCode { private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//随机因子 private $code;//验证码 private $codelen = 4;//验证码长度 private $width = 130;//宽度 private $height = 50;//高度 private $img;//图形资源句柄 private $font;//指定的字体 private $fontsize = 20;//指定字体大小 private $fontcolor;//指定字体颜色 //构造方法初始化 public function __construct() { $this->font = public_path() . '/fonts/Elephant.ttf';//注意字体路径要写对，否则显示不了图片 $this->createCode(); } //生成随机码 private function createCode() { $_len = strlen($this->charset) - 1; for ($i = 0;$i < $this->codelen;++$i) { $this->code .= $this->charset[mt_rand(0, $_len)]; } } //生成背景 private function createBg() { $this->img = imagecreatetruecolor($this->width, $this->height); $color = imagecolorallocate($this->img, mt_rand(157, 255), mt_rand(157, 255), mt_rand(157, 255)); imagefilledrectangle($this->img, 0, $this->height, $this->width, 0, $color); } //生成文字 private function createFont() { $_x = $this->width / $this->codelen; for ($i = 0;$i < $this->codelen;++$i) { $this->fontcolor = imagecolorallocate($this->img, mt_rand(0, 156), mt_rand(0, 156), mt_rand(0, 156)); 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]); } } //生成线条、雪花 private function createLine() { //线条 for ($i = 0;$i < 6;++$i) { $color = imagecolorallocate($this->img, mt_rand(0, 156), mt_rand(0, 156), mt_rand(0, 156)); imageline($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $color); } //雪花 for ($i = 0;$i < 100;++$i) { $color = imagecolorallocate($this->img, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255)); imagestring($this->img, mt_rand(1, 5), mt_rand(0, $this->width), mt_rand(0, $this->height), '*', $color); } } //输出 private function outPut() { header('Content-type:image/png'); imagepng($this->img); imagedestroy($this->img); } //对外生成 public function doimg() { $this->createBg(); $this->createLine(); $this->createFont(); $this->outPut(); } //获取验证码 public function getCode() { return strtolower($this->code); } }