PHP實現簡單實用的驗證碼類

2020-03-22 18:08:29

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* $image- config('寬度','高度','字符個數','驗證碼session索引');* $image- create();//這樣就會向瀏覽器輸出一張圖片* //所有參數都可以省略，* 默認是：寬80 高20 字符數4 驗證碼session索引captcha_code* 第四個參數即把驗證碼存到$_SESSION['captcha_code']* 最簡單使用示例:* $image=new Captcha();* $image- create();//這樣就會向瀏覽器輸出一張圖片html' target='_blank'>class Captchaprivate $width=80,$height=20,$codenum=4;public $checkcode; //產生的驗證碼private $checkimage; //驗證碼圖片 private $disturbColor = ''; //干擾像素private $session_flag='captcha_code';//存到session中的索引//嘗試開始sessionfunction __construct(){ @session_start();* 參數：（寬度，高度，字符個數）function config($width='80',$height='20',$codenum='4',$session_flag='captcha_code') $this- width=$width; $this- height=$height; $this- codenum=$codenum; $this- session_flag=$session_flag;function create() //輸出頭 $this- outFileHeader(); //產生驗證碼 $this- createCode(); //產生圖片 $this- createImage(); //設置干擾像素 $this- setDisturbColor(); //往圖片上寫驗證碼 $this- writeCheckCodeToImage(); imagepng($this- checkimage); imagedestroy($this- checkimage); $_SESSION[$this- session_flag]=$this- checkcode; * @brief 輸出頭private function outFileHeader() header ("Content-type: image/png"); * 產生驗證碼private function createCode() $this- checkcode = strtoupper(substr(md5(rand()),0,$this- codenum)); * 產生驗證碼圖片private function createImage() $this- checkimage = @imagecreate($this- width,$this- height); $back = imagecolorallocate($this- checkimage,255,255,255); $border = imagecolorallocate($this- checkimage,0,0,0); imagefilledrectangle($this- checkimage,0,0,$this- width - 1,$this- height - 1,$back); // 白色底 imagerectangle($this- checkimage,0,0,$this- width - 1,$this- height - 1,$border); // 黑色邊框 * 設置圖片的干擾像素 private function setDisturbColor() for ($i=0;$i =200;$i++) $this- disturbColor = imagecolorallocate($this- checkimage, rand(0,255), rand(0,255), rand(0,255)); imagesetpixel($this- checkimage,rand(2,128),rand(2,38),$this- disturbColor); * 在驗證碼圖片上逐個畫上驗證碼private function writeCheckCodeToImage() for ($i=0;$i $this- codenum;$i++) $bg_color = imagecolorallocate ($this- checkimage, rand(0,255), rand(0,128), rand(0,255)); $x = floor($this- width/$this- codenum)*$i; $y = rand(0,$this- height-15); imagechar ($this- checkimage, rand(5,8), $x+5, $y, $this- checkcode[$i], $bg_color);function __destruct() unset($this- width,$this- height,$this- codenum,$this- session_flag);PHP教程

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