简单的验证码制作
简单的验证码制作
html
<?php
if (isset($_REQUEST['authcode'])){
session_start();
if (strtolower($_REQUEST['authcode'])==$_SESSION['authcode']){
echo '<font color=#0000CC>输入正确</font>';
}else {
echo '<font color=#0000CC>输入错误</font>';
}
exit();
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//CN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>管理员登录 -- 企业网站后台管理系统</title>
<title>Insert title here</title>
</head>
<body>
<form action="./yanz.php" method="post">
<p>验证图片：<img border="1" src="./ceshi.php?r=<?php echo rand();?>"width="100" height="30"></p>
<p>请输入验证内容：<input type="text"name="authcode" vlane=""></p>
<p><input type="submit" value="提交" style="padding: 6px 20px;"></p>
</form>
</body>
</html>
PHP--数字，英文
<?php
//创建gd画布
session_start();
$width=100;
$height=30;
$image=imagecreatetruecolor($width, $height);
$bgcolor = imagecolorallocate( $image, 255, 255, 255 );
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);
}*/
$captch_code='';
for ($i=0;$i<4;$i++){
$fontsize=6;
$fontcolor=imagecolorallocate($image, rand(0,120),rand(0,120),rand(0,120));
$data='abcdefghijklmnopqrtuvwxyz123456789';
$fontcontent=substr($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);
}
$_SESSION['authcode']=$captch_code;
//干扰元素之干扰点
for ($i=0;$i<200;$i++){
$pointcolor=imagecolorallocate($image, rand(0,120),rand(0,120),rand(0,120));
imagesetpixel($image, rand(1,99), rand(1,29), $pointcolor);
}
//干扰元素之干扰线
for ($i=0;$i<3;$i++){
$linecolor=imagecolorallocate($image, rand(80,120),rand(80,120),rand(80,120));
imageline($image, rand(1,99), rand(1,29), rand(1,99), rand(1,29), $linecolor);
}
header('content-type:image/png');
imagepng($image);
imagedestroy($image);
PHP--图片
<?php
//创建gd画布
session_start();
$table=arraay(
'pic0'=>'你',
'pic1'=>'我',
'pic2'=>'他',
'pic3'=>'吗',
);
$index=rand(0,3);
$value=$table['pic'.$index];
$_SESSION['authcode']=$value;
$filename=dirname(_FILE_).'\\pic'.$index.'jpg';
$content=file_get_contents($filename);
header('content-type:image/jpg');
echo $content;
PHP--文字
<?php
//创建gd画布
session_start();
$width=200;
$height=60;
$image=imagecreatetruecolor($width, $height);
$bgcolor = imagecolorallocate( $image, 255, 255, 255 );
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);
}*/
$fontface='SIMYOU.TTF';
$str='汉字'
$strdb_code='';
//$strdb=array('你','是','谁','呢');
$strdb=str_split($str,3);
$captch_code='';
for ($i=0;$i<4;$i++){
//$fontsize=6;
$fontcolor=imagecolorallocate($image, rand(0,120),rand(0,120),rand(0,120));
//$cn=$strdb[$i];
$index=rand(0,count($strdb));
$cn=$strdb[$index];
$captch_code.=$cn;
imagettftext($image, mt_rand(20,40),mt_rand(-60 ,60), (40*$i+20), mt_rand(30,35), $fontcolor, $fontfile, $fontface,$cn);
}
$_SESSION['authcode']=$captch_code;
//干扰元素之干扰点
for ($i=0;$i<200;$i++){
$pointcolor=imagecolorallocate($image, rand(50,200),rand(50,200),rand(50,200));
imagesetpixel($image, rand(1,299), rand(1,59), $pointcolor);
}
//干扰元素之干扰线
for ($i=0;$i<3;$i++){
$linecolor=imagecolorallocate($image, rand(80,120),rand(80,120),rand(80,120));
imageline($image, rand(1,99), rand(1,29), rand(1,99), rand(1,29), $linecolor);
}
header('content-type:image/png');
imagepng($image);
imagedestroy($image);
