Rumah > Artikel > pembangunan bahagian belakang > PHP图片验证码类文件源码分享
PHP图片验证码类文件源码分享
- 墨辰丷asal
- 2018-06-02 09:06:552071semak imbas
本文给大家汇总介绍了3种php编写的图片验证码类，代码都非常的简单实用，有相同需求的小伙伴可以收藏下。
适用于自定义的验证码类！
<?php
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
Class Image{
private $img;
public $width = 85;
public $height = 25;
public $code;
public $code_len = 4;
public $code_str = "329832983DSDSKDSLKQWEWQ2lkfDSFSDjfdsfdsjwlkfj93290KFDSKJFDSOIDSLK";
public $bg_color = '#DCDCDC';
public $font_size = 16;
public $font = 'font.ttf';
public $font_color = '#000000';
//创建验证码饿字符创
public function create_code(){
$code = '';
for( $i=0;$i<$this->code_len;$i++ ){
$code .= $this->code_str[mt_rand(0, strlen($this->code_str)-1)];
}
return $this->code = $code;
}
//输出图像
public function getImage(){
$w = $this->width;
$h = $this->height;
$bg_color = $this->bg_color;
$img = imagecreatetruecolor($w, $h);
$bg_color = imagecolorallocate($img,
hexdec(substr($bg_color, 1,2)), hexdec(substr($bg_color, 3,2)), hexdec(substr($bg_color, 5,2)));
imagefill($img, 0, 0, $bg_color);
$this->img = $img;
$this->create_font();
$this->create_pix();
$this->show_code();
}
//写入验证码
public function create_font(){
$this->create_code();
$color = $this->font_color;
$font_color = imagecolorallocate($this->img, hexdec(substr($color,1,2)), hexdec(substr($color, 3,2)), hexdec(substr($color,5,2)));
$x = $this->width/$this->code_len;
for( $i=0;$i<$this->code_len;$i++ ){
$txt_color = imagecolorallocate($this->img, mt_rand(0,100), mt_rand(0, 150), mt_rand(0, 200));
imagettftext($this->img, $this->font_size, mt_rand(-30, 30), $x*$i+mt_rand(3, 6), mt_rand($this->height/1.2, $this->height), $txt_color, $this->font , $this->code[$i]);
//imagestring($this->img, $this->font_size, $x*$i+mt_rand(3, 6),mt_rand(0, $this->height/4) , $this->code[$i], $font_color);
}
$this->font_color = $font_color;
}
//画干扰线
public function create_pix(){
$pix_color= $this->font_color;
for($i=0;$i<100;$i++){
imagesetpixel($this->img, mt_rand(0, $this->width),mt_rand(0, $this->height), $pix_color);
}
for($j=0;$j<4;$j++){
imagesetthickness($this->img, mt_rand(1, 2));
imageline($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $pix_color);
}
}
//得到验证码
public function getCode(){
return strtoupper($this->code);
}
//输出验证码
private function show_code(){
header("Content-type:image/png");
imagepng($this->img);
imagedestroy($this->img);
}
}我们再来看一例代码：
生成图片类型验证码，验证码包含数字和大写字母，session中存放md5加密后的验证码
<?php
/**
* 图片验证码类
* 生成图片类型验证码，验证码包含数字和大写字母，session中存放md5加密后的验证码
*
* 使用方法：
* $captcha = new Catpcha();
* $captcha->buildAndExportImage();
*
* 作 者: luojing
* 创建时间: 2013-3-27 上午11:42:12
*/
class Captcha {
private $width;//宽度
private $height; //高度
private $codeNum;//验证码字符数量
private $image;//验证码图像资源
private $sessionKey;//session中保存的名字
private $captcha;//验证码字符串
const charWidth = 10;//单个字符宽度,根据输出字符大小而变
/**
* 创建验证码类，初始化相关参数
* @param $width 图片宽度
* @param $height 图片高度
* @param $codeNum 验证码字符数量
* @param $sessionKey session中保存的名字
*/
function __construct($width = 50, $height = 20, $codeNum = 4, $sessionKey = 'captcha') {
$this->width = $width;
$this->height = $height;
$this->codeNum = $codeNum;
$this->sessionKey = $sessionKey;
//保证最小高度和宽度
if($height < 20) {
$this->height = 20;
}
if($width < ($codeNum * self::charWidth + 10)) {//左右各保留5像素空隙
$this->width = $codeNum * self::charWidth + 10;
}
}
/**
* 构造并输出验证码图片
*/
public function buildAndExportImage() {
$this->createImage();
$this->setDisturb();
$this->setCaptcha();
$this->exportImage();
}
/**
* 构造图像，设置底色
*/
private function createImage() {
//创建图像
$this->image = imagecreatetruecolor($this->width, $this->height);
//创建背景色
$bg = imagecolorallocate($this->image, mt_rand(220, 255), mt_rand(220, 255), mt_rand(220, 255));
//填充背景色
imagefilledrectangle($this->image, 0, 0, $this->width - 1, $this->height - 1, $bg);
}
/**
* 设置干扰元素
*/
private function setDisturb() {
//设置干扰点
for($i = 0; $i < 150; $i++) {
$color = imagecolorallocate($this->image, mt_rand(150, 200), mt_rand(150, 200), mt_rand(150, 200));
imagesetpixel($this->image, mt_rand(5, $this->width - 10), mt_rand(5, $this->height - 3), $color);
}
//设置干扰线
for($i = 0; $i < 10; $i++) {
$color = imagecolorallocate($this->image, mt_rand(150, 220), mt_rand(150, 220), mt_rand(150, 220));
imagearc($this->image, mt_rand(-10, $this->width), mt_rand(-10, $this->height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $color);
}
//创建边框色
$border = imagecolorallocate($this->image, mt_rand(0, 50), mt_rand(0, 50), mt_rand(0, 50));
//画边框
imagerectangle($this->image, 0, 0, $this->width - 1, $this->height - 1, $border);
}
/**
* 产生并绘制验证码
*/
private function setCaptcha() {
$str = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ';
//生成验证码字符
for($i = 0; $i < $this->codeNum; $i++) {
$this->captcha .= $str{mt_rand(0, strlen($str) - 1)};
}
//绘制验证码
for($i = 0; $i < strlen($this->captcha); $i++) {
$color = imagecolorallocate($this->image, mt_rand(0, 200), mt_rand(0, 200), mt_rand(0, 200));
$x = floor(($this->width - 10)/$this->codeNum);
$x = $x*$i + floor(($x-self::charWidth)/2) + 5;
$y = mt_rand(2, $this->height - 20);
imagechar($this->image, 5, $x, $y, $this->captcha{$i}, $color);
}
}
/*
* 输出图像,验证码保存到session中
*/
private function exportImage() {
if(imagetypes() & IMG_GIF){
header('Content-type:image/gif');
imagegif($this->image);
} else if(imagetypes() & IMG_PNG){
header('Content-type:image/png');
imagepng($this->iamge);
} else if(imagetypes() & IMG_JPEG) {
header('Content-type:image/jpeg');
imagepng($this->iamge);
} else {
imagedestroy($this->image);
die("Don't support image type!");
}
//将验证码信息保存到session中，md5加密
if(!isset($_SESSION)){
session_start();
}
$_SESSION[$this->sessionKey] = md5($this->captcha);
imagedestroy($this->image);
}
function __destruct() {
unset($this->width, $this->height, $this->codeNum,$this->captcha);
}
}例三：
<?php
class ValidationCode {
private $width;
private $height;
private $codeNum;
private $image; //图像资源
private $disturbColorNum;
private $checkCode;
function __construct($width=80, $height=20, $codeNum=4){
$this->width=$width;
$this->height=$height;
$this->codeNum=$codeNum;
$this->checkCode=$this->createCheckCode();
$number=floor($width*$height/15);
if($number > 240-$codeNum){
$this->disturbColorNum= 240-$codeNum;
}else{
$this->disturbColorNum=$number;
}
}
//通过访问该方法向浏览器中输出图像
function showImage($fontFace=""){
//第一步：创建图像背景
$this->createImage();
//第二步：设置干扰元素
$this->setDisturbColor();
//第三步：向图像中随机画出文本
$this->outputText($fontFace);
//第四步：输出图像
$this->outputImage();
}
//通过调用该方法获取随机创建的验证码字符串
function getCheckCode(){
return $this->checkCode;
}
private function createImage(){
//创建图像资源
$this->image=imagecreatetruecolor($this->width, $this->height);
//随机背景色
$backColor=imagecolorallocate($this->image, rand(225, 255), rand(225,255), rand(225, 255));
//为背景添充颜色
imagefill($this->image, 0, 0, $backColor);
//设置边框颜色
$border=imagecolorallocate($this->image, 0, 0, 0);
//画出矩形边框
imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $border);
}
private function setDisturbColor(){
for($i=0; $i<$this->disturbColorNum; $i++){
$color=imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));
imagesetpixel($this->image, rand(1, $this->width-2), rand(1, $this->height-2), $color);
}
for($i=0; $i<10; $i++){
$color=imagecolorallocate($this->image, rand(200, 255), rand(200, 255), rand(200, 255));
imagearc($this->image, rand(-10, $this->width), rand(-10, $this->height), rand(30, 300), rand(20, 200), 55, 44, $color);
}
}
private function createCheckCode(){
//这里主要产生随机码，从2开始是为了区分1和l
$code="23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";
$string='';
for($i=0; $i < $this->codeNum; $i++){
$char=$code{rand(0, strlen($code)-1)};
$string.=$char;
}
return $string;
}
private function outputText($fontFace=""){
for($i=0; $i<$this->codeNum; $i++){
$fontcolor=imagecolorallocate($this->image, rand(0, 128), rand(0, 128), rand(0, 128));
if($fontFace==""){
$fontsize=rand(3, 5);
$x=floor($this->width/$this->codeNum)*$i+3;
$y=rand(0, $this->height-15);
imagechar($this->image,$fontsize, $x, $y, $this->checkCode{$i},$fontcolor);
}else{
$fontsize=rand(12, 16);
$x=floor(($this->width-8)/$this->codeNum)*$i+8;
$y=rand($fontSize+5, $this->height);
imagettftext($this->image,$fontsize,rand(-30, 30),$x,$y ,$fontcolor, $fontFace, $this->checkCode{$i});
}
}
}
private function outputImage() {
if(imagetypes() & IMG_GIF){
header("Content-Type:image/gif");
imagepng($this->image);
}else if(imagetypes() & IMG_JPG){
header("Content-Type:image/jpeg");
imagepng($this->image);
}else if(imagetypes() & IMG_PNG){
header("Content-Type:image/png");
imagepng($this->image);
}else if(imagetypes() & IMG_WBMP){
header("Content-Type:image/vnd.wap.wbmp");
imagepng($this->image);
}else{
die("PHP不支持图像创建");
}
}
function __destruct(){
imagedestroy($this->image);
}
}使用如下：
测试，调用验证码类
code.php
<?php session_start(); include "validationcode.class.php"; $code=new ValidationCode(80, 20, 4); $code->showImage(); //输出到页面中供 注册或登录使用 $_SESSION["code"]=$code->getCheckCode(); //将验证码保存到服务器中
总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。
相关推荐：
php使用get_class_methods()函数获取分类的方法实例分析
Atas ialah kandungan terperinci PHP图片验证码类文件源码分享. Untuk maklumat lanjut, sila ikut artikel berkaitan lain di laman web China PHP!
Kenyataan：
Kandungan artikel ini disumbangkan secara sukarela oleh netizen, dan hak cipta adalah milik pengarang asal. Laman web ini tidak memikul tanggungjawab undang-undang yang sepadan. Jika anda menemui sebarang kandungan yang disyaki plagiarisme atau pelanggaran, sila hubungi admin@php.cn
Artikel sebelumnya：PHP session 会话处理函数实例详解Artikel seterusnya：PHP获取指定时间段之间的 年,月,天,时,分,秒的方法
Artikel berkaitan
Lihat lagi- Cara menggunakan cURL untuk melaksanakan permintaan Dapatkan dan Hantar dalam PHP
- Cara menggunakan cURL untuk melaksanakan permintaan Dapatkan dan Hantar dalam PHP
- Cara menggunakan cURL untuk melaksanakan permintaan Dapatkan dan Hantar dalam PHP
- Cara menggunakan cURL untuk melaksanakan permintaan Dapatkan dan Hantar dalam PHP
- Semua simbol ungkapan dalam ungkapan biasa (ringkasan)