时间:2021-07-01 10:21:17 帮助过:11人阅读
推荐学习PHP开发验证码教程
1.创建验证码底图
- <?php
- $image = imagecreatetruecolor(100,30);
- $bgcolor = imagecolorallocate($image,000,255,255);//#FFFFFFFFFFFF
- imagefill($image,0,0,$bgcolor);
- header('content-type: image/png');
- imagepng($image);
- //销毁
- imagedestroy($image);
- ?>
课程链接:http://www.gxlcms.com/code/3872.html
2.实现数字验证码
- <?php
- $image = imagecreatetruecolor(100,30);
- $bgcolor = imagecolorallocate($image,255,255,255);//#FFFFFFFFFFFF
- imagefill($image,0,0,$bgcolor);
- for ($i=0;$i<4;$i++){
- $fontsize = 6;
- $fontcolor = imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120));
- $fontcontent = rand(0,9);
- $x = ($i * 100/4)+rand(5,10);
- $y = rand(5,10);
- imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor);
- }
- header('content-type: image/png');
- imagepng($image);
- //销毁
- imagedestroy($image);
- ?>
课程链接:http://www.gxlcms.com/code/3874.html
3.增加干扰元素
- <?php
- $image = imagecreatetruecolor(100,30);
- $bgcolor = imagecolorallocate($image,255,255,255);//#FFFFFFFFFFFF
- imagefill($image,0,0,$bgcolor);
- for ($i=0;$i<4;$i++){
- $fontsize = 6;
- $fontcolor = imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120));
- $fontcontent = rand(0,9);
- $x = ($i * 100/4)+rand(5,10);
- $y = rand(5,10);
- imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor);
- }
- for($i=0;$i<200;$i++){
- $pointcolor = imagecolorallocate($image,rand(50,200),rand(50,200),rand(50,200));
- imagesetpixel($image,rand(1,99),rand(1,29),$pointcolor);
- }
- header('content-type: image/png');
- imagepng($image);
- //销毁
- imagedestroy($image);
- ?>
课程链接:http://www.gxlcms.com/code/3875.html
4.字母和数字混合验证码
- <?php
- $image = imagecreatetruecolor(100,30);
- $bgcolor = imagecolorallocate($image,255,255,255);//#FFFFFFFFFFFF
- imagefill($image,0,0,$bgcolor);
- for ($i=0;$i<4;$i++){
- $fontsize = 6;
- $fontcolor = imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120));
- $data='abcdefghijklmnopqrstuvwxyz1234567890';
- $fontcontent=substr($data,rand(0,strlen($data)),1);
- $x = ($i * 100/4)+rand(5,10);
- $y = rand(5,10);
- imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor);
- }
- for($i=0;$i<200;$i++){
- $pointcolor = imagecolorallocate($image,rand(50,200),rand(50,200),rand(50,200));
- imagesetpixel($image,rand(1,99),rand(1,29),$pointcolor);
- }
- for($i=0;$i<8;$i++){
- $linecolor = imagecolorallocate($image,rand(60,220),rand(60,220),rand(60,220));
- imageline($image,rand(1,99),rand(1,29),rand(1,99),rand(1,29),$linecolor);
- }
- header('content-type: image/png');
- imagepng($image);
- //销毁
- imagedestroy($image);
- ?>
课程链接:http://www.gxlcms.com/code/3878.html
5.使用session存储验证信息
- <?php
- session_start();
- $image = imagecreatetruecolor(100,30);
- $bgcolor = imagecolorallocate($image,255,255,255);//#FFFFFFFFFFFF
- imagefill($image,0,0,$bgcolor);
- $captch_code="";
- for ($i=0;$i<4;$i++){
- $fontsize = 6;
- $fontcolor = imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120));
- $data='abcdefghijklmnopqrstuvwxyz1234567890';
- $fontcontent=substr($data,rand(0,strlen($data)),1);
- $captch_code.="$fontcontent";
- $x = ($i * 100/4)+rand(5,10);
- $y = rand(5,10);
- imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor);
- }
- $_SESSION['code']=$captch_code;
- for($i=0;$i<200;$i++){
- $pointcolor = imagecolorallocate($image,rand(50,200),rand(50,200),rand(50,200));
- imagesetpixel($image,rand(1,99),rand(1,29),$pointcolor);
- }
- for($i=0;$i<8;$i++){
- $linecolor = imagecolorallocate($image,rand(60,220),rand(60,220),rand(60,220));
- imageline($image,rand(1,99),rand(1,29),rand(1,99),rand(1,29),$linecolor);
- }
- header('content-type: image/png');
- imagepng($image);
- //销毁
- imagedestroy($image);
- ?>
课程链接:http://www.gxlcms.com/code/3879.html
6.验证码的使用
- <?php
- session_start();
- $image = imagecreatetruecolor(100,30);
- $bgcolor = imagecolorallocate($image,255,255,255);//#FFFFFFFFFFFF
- imagefill($image,0,0,$bgcolor);
- $captch_code="";
- for ($i=0;$i<4;$i++){
- $fontsize = 6;
- $fontcolor = imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120));
- $data='abcdefghijklmnopqrstuvwxyz1234567890';
- $fontcontent=substr($data,rand(0,strlen($data)),1);
- $captch_code.="$fontcontent";
- $x = ($i * 100/4)+rand(5,10);
- $y = rand(5,10);
- imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor);
- }
- $_SESSION['code']=$captch_code;
- for($i=0;$i<200;$i++){
- $pointcolor = imagecolorallocate($image,rand(50,200),rand(50,200),rand(50,200));
- imagesetpixel($image,rand(1,99),rand(1,29),$pointcolor);
- }
- for($i=0;$i<5;$i++){
- $linecolor = imagecolorallocate($image,rand(60,220),rand(60,220),rand(60,220));
- imageline($image,rand(1,99),rand(1,29),rand(1,99),rand(1,29),$linecolor);
- }
- header('content-type: image/png');
- imagepng($image);
- //销毁
- imagedestroy($image);
- ?>
课程链接:http://www.gxlcms.com/code/4832.html
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