本文分享了php实现可运算的验证码的代码实例，希望对大家的学习有所帮助。
demo.php代码
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<?php
session_start();
if(!emptyempty($_POST['Login'])){
if(md5(strtoupper($_POST['Login'])) == $_SESSION['Login']){
echo 'Correct';
}else{
echo 'Error';
}
}
?>
<form method="post">
<input type="text" name="Login" value="" /><img src="img.php?Action=Login&imgW=80&imgH=30" align="absmiddle">
<input type="submit" value="Login" />
</form>
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img.php代码
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<?php
session_start();
/**
* 随机的数字,之和验证码
* 修改日期 2006-12-20
*/
function getCode ($length = 32, $mode = 0)
{
switch ($mode)
{
case '1':
$str = '123456789';
break;
case '2':
$str = 'abcdefghijklmnopqrstuvwxyz';
break;
case '3':
$str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
break;
case '4':
$str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
break;
case '5':
$str = 'ABCDEFGHIJKLMNPQRSTUVWXYZ123456789';
break;
case '6':
$str = 'abcdefghijklmnopqrstuvwxyz1234567890';
break;
default:
$str = 'ABCDEFGHIJKLMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz23456789';
break;
}
$result = '';
$l = strlen($str)-1;
for($i = 0;$i < $length;$i ++)
{
$num = rand(0, $l);
$result .= $str[$num];
}
return $result;
}
//建立验证图片
function createAuthNumImg($randStr,$imgW=100,$imgH=40,$fontName)
{
header ("content-type: image/png");
$image = imagecreate($imgW , $imgH);
$color_white = imagecolorallocate($image , 255 , 255 , 255);
$color_gray = imagecolorallocate($image , 228 , 228 , 228);
$color_black = imagecolorallocate($image , 255 , 102 , 204);
for ($i = 0 ; $i < 1000 ; $i++)
{
imagesetpixel($image , mt_rand(0 , $imgW) , mt_rand(0 , $imgH) , $color_gray);
}
imagerectangle($image , 0 , 0 , $imgW - 1 , $imgH - 1 , $color_gray);
for ($i=10;$i<$imgH;$i+=10)
imageline($image, 0, $i, $imgW, $i, $color_gray);
imagettftext($image,16,5,3,25,$color_black,$fontName,$randStr);
for ($i=10;$i<$imgW;$i+=10)
imageline($image, $i, 0, $i, $imgH, $color_gray);
imagepng($image);
imagedestroy($image);
}
$a=GetCode(1,1);
$b=GetCode(1,1);
$c=GetCode(1,1);
$Passport=$a."+".$b."+".$c;
$Total=$a+$b+$c;
$Total;
$_SESSION[$_GET['Action']]=md5(strtoupper($Total));
createAuthNumImg($Passport,$_GET['imgW'],$_GET['imgH'],"verdana.ttf");
?>
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以上就是为大家介绍的php可运算的验证码全部代码，希望对大家的学习有所帮助。