php验证码制作是对php基本功的考核,php验证码制作必需开启gd库,因为要用到gd库里面的不少函数
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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.php.cn/code/3872.html
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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.php.cn/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.php.cn/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.php.cn/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.php.cn/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.php.cn/code/4832.html
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