php是有GD生成验证码

最新推荐文章于 2024-12-04 07:33:21 发布

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html代码

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" lang="en_US" xml:lang="en_US">

<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<title> </title>
</head>
<body>
<form action="check.php" name="form1" method="post">
<table>
<tr>
<td>验证码：<input type="text" name="chkcode" value="" size="15" maxlength="4"></td>
<td><iframe src="crecode.php" height="50px" width="80px" frameborder="0" id="chkimg"></iframe>
<input type="button" value="看不清，换一张" onclick="chkimg.location.reload();">
</td>
</tr>
</table>
<input type="hidden" value="4" name="checkcnt"/>
<input type="submit" name="submit1" value="提交"/>
</form>
</body>
</html>

########################################################################################

生成验证码图像的代码（crecode.php）

#######################################################################################

<?php
/*
* Created on 2015-5-22
*
* To change the template for this generated file go to
* Window - Preferences - PHPeclipse - PHP - Code Templates
*/
header("Content-type:image/png");
session_start();
$authnum="";
$str="abcdefghijkmnopqrstuvwxyz1234567890";
$strLength=strlen($str);
for($i=1;$i<=4;$i++){
$num=rand(0,$strLength-1);
$authnum .=$str[$num];
}

$_SESSION["authnum"]=$authnum;
srand((double)microtime()*1000000);
$im=imagecreate(50,20);

$gray=imagecolorallocate($im,200,200,100);
$white=imagecolorallocate($im,255,255,255);

imagefill($im,10,5,$gray);
$li=imagecolorallocate($im,150,150,150);
for($i=0;$i<3;$i++){
imageline($im,rand(0,20),rand(0,50),rand(20,40),rand(0,50),$li);
}

for($i=0;$i<strlen($_SESSION['authnum']);$i++){
$strColor=imagecolorallocate($im,mt_rand(0,100),mt_rand(50,150),mt_rand(100,200));
$fontSize=mt_rand(3,5);
$x=mt_rand(1,5)+50*$i/4;
$y=mt_rand(1,5);
imagestring($im,$fontSize,$x,$y,$_SESSION['authnum'][$i],$strColor);
}
for($i=0;$i<90;$i++){
imagesetpixel($im,rand()%70,rand()%30,$gray);
}
imagepng($im);
imagedestroy($im);
?>

##########################################################

验证验证码

#########################################################

<?php
/*
* Created on 2015-5-22
*
* To change the template for this generated file go to
* Window - Preferences - PHPeclipse - PHP - Code Templates
*/
header("Content-type:text/html;charset=utf-8");
session_start();
$chkCode=strtoupper($_POST['chkcode']);
$auth=strtoupper($_SESSION['authnum']);

//echo $chkCode;
//echo "<br>";
// echo $_SESSION['authnum'];
if($chkCode==$auth){
echo "验证成功！";

}else{
echo "验证失败！";

}
session_destroy();
?>