驗證碼

時間 2019-12-06

標籤驗證碼简体版

原文原文鏈接

<?php defined('BASEPATH') OR exit('No direct script access allowed'); class ValidateCode extends CI_Controller { private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//隨機因子 private $code;//驗證碼 private $codelen = 4;//驗證碼長度 private $width = 130;//寬度 private $height = 50;//高度 private $img;//圖形資源句柄 private $font;//指定的字體 private $fontsize = 20;//指定字體大小 private $fontcolor;//指定字體顏色 //構造方法初始化 public function __construct() { parent::__construct(); $this->font = dirname(__FILE__).'/font/elephant.ttf';//注意字體路徑要寫對，不然顯示不了圖片 } //生成隨機碼 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[$i]); } } //生成線條、雪花 private function createLine() { //線條 for ($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); } } //輸出 private function outPut() { header('Content-type:image/png'); imagepng($this->img); imagedestroy($this->img); } //對外生成 public function index() { $this->createBg(); $this->createCode(); $this->createLine(); $this->createFont(); $this->_setSession(); $this->outPut(); } private function _setSession() { $newdata = array( 'validateCode'=>$this->code ); $this->session->set_userdata($newdata); } // public function getSession(){ // echo $this->session->userdata('validateCode'); // } public function c(){ $this->load->view('c'); } } ?>php

<!DOCTYPE html>html

<html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <img src="<?=site_url('validateCode')?>" onclick="this.src='<?=site_url('validateCode?')?>'+Math.random();"> </body> </html>session

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