程序中用到的字体请替换成自己喜欢的。不提供下载。
1.验证码赋值给$_SESSION['verify']
<?php
session_start();
function GetVerify($length)
{
$strings = Array('3','4','5','6','7','a','b','c','d','e','f','h','i','j','k','m','n','p','r','s','t','u','v','w','x','y');
$chrNum = "";
$count = count($strings);
for ($i = 1; $i <= $length; $i++) { //循环随机取字符生成字符串$chrNum .= $strings[rand(0,$count-1)];
}
return $chrNum;
}
$fontSize = 15; //定义字体大小
$length = 4; //定义字符串长度
$strNum = GetVerify($length); //获取一个随机字符串
$_SESSION['verify'] = $strNum; //付值给session
$width = 70; //定义图片宽度
$height = 24; //定义图片高度
$im = imagecreate($width,$height); //生成一张指定宽高的图片
$backgroundcolor = imagecolorallocate ($im, 255, 255, 255); //生成背景色
$frameColor = imageColorAllocate($im, 150, 150, 150); //生成边框色
$font = realpath("arial.ttf"); //提取字体文件，开始写字
for($i = 0; $i < $length; $i++) {
$charY = ($height+9)/2 + rand(-1,1); //定义字符Y坐标
$charX = $i*15+8; //定义字符X坐标
//生成字符颜色
$text_color = imagecolorallocate($im, mt_rand(50, 200), mt_rand(50, 128), mt_rand(50, 200));
$angle = rand(-20,20); //生成字符角度
//写入字符
imageTTFText($im, $fontSize, $angle, $charX, $charY, $text_color, $font, $strNum[$i]);
}
for($i=0; $i <= 5; $i++) { //循环画背景线
$linecolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
$linex = mt_rand(1, $width-1);
$liney = mt_rand(1, $height-1);
imageline($im, $linex, $liney, $linex + mt_rand(0, 4) - 2, $liney + mt_rand(0, 4) - 2, $linecolor);
}
for($i=0; $i <= 32; $i++) { //循环画背景点,生成麻点效果
$pointcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
imagesetpixel($im, mt_rand(1, $width-1), mt_rand(1, $height-1), $pointcolor);
}
imagerectangle($im, 0, 0, $width-1 , $height-1 , $frameColor); //画边框
ob_clean();
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
/**
* 功能：生成随机字符串
*/
exit;
?>
2.验证码赋值给$_SESSION['lgcode']
<?php
//获取随机字符
$rndstring = "";
for($i=0;$i<4;$i++){
$rndstring .= chr(mt_rand(65,90));
}
//如果支持GD，则绘图
if(function_exists("imagecreate"))
{
//PutCookie("dd_ckstr",strtolower($rndstring),1800,"/");
session_register('lgcode');
$_SESSION['lgcode'] = strtolower($rndstring);
$rndcodelen = strlen($rndstring);
//图片大小
$im = imagecreate(50,20);
//字体
$font_type = dirname(__FILE__)."/./ant2.ttf";
//背景颜色
$bgcolor = ImageColorAllocate($im, 245,245,245);
//边框色
$iborder = ImageColorAllocate($im, 0x71,0x76,0x67);
//字体色
//不支持 imagettftext
$fontColor = ImageColorAllocate($im, 0x50,0x4d,0x47);
//支持 imagettftext
$fontColor2 = ImageColorAllocate($im, 0x36,0x38,0x32);
//阴影
$fontColor1 = ImageColorAllocate($im, 0xbd,0xc0,0xb8);
//杂点背景线
//$lineColor1 = ImageColorAllocate($im, 130,220,245);
//$lineColor2 = ImageColorAllocate($im, 225,245,255);
//背景线
//for($j=3;$j<=16;$j=$j+3) imageline($im,2,$j,48,$j,$lineColor1);
//for($j=2;$j<52;$j=$j+(mt_rand(3,6))) imageline($im,$j,2,$j-6,18,$lineColor2);
//边框
imagerectangle($im, 0, 0, 49, 19, $iborder);
$strposs = array();
//文字
for($i=0;$i<$rndcodelen;$i++){
if(function_exists("imagettftext")){
$strposs[$i][0] = $i*10+6;
$strposs[$i][1] = mt_rand(15,18);
imagettftext($im, 11, 5, $strposs[$i][0]+1, $strposs[$i][1]+1, $fontColor1, $font_type, $rndstring[$i]);
}
else{
imagestring($im, 5, $i*10+6, mt_rand(2,4), $rndstring[$i], $fontColor);
}
}
//文字
for($i=0;$i<$rndcodelen;$i++){
if(function_exists("imagettftext")){
imagettftext($im, 11,5, $strposs[$i][0]-1, $strposs[$i][1]-1, $fontColor2, $font_type, $rndstring[$i]);
}
}
header("Pragma:no-cache\r\n");
header("Cache-Control:no-cache\r\n");
header("Expires:0\r\n");
//输出特定类型的图片格式，优先级为 gif -> jpg ->png
if(function_exists("imagejpeg")){
header("content-type:image/jpeg\r\n");
imagejpeg($im);
}else{
header("content-type:image/png\r\n");
imagepng($im);
}
ImageDestroy($im);
}else{ //不支持GD，只输出字母 ABCD
//PutCookie("dd_ckstr","abcd",1800,"/");
session_register('lgcode');
$_SESSION['lgcode'] = "abcd";
header("content-type:image/jpeg\r\n");
header("Pragma:no-cache\r\n");
header("Cache-Control:no-cache\r\n");
header("Expires:0\r\n");
$fp = fopen("./vdcode.jpg","r");
echo fread($fp,filesize("./vdcode.jpg"));
fclose($fp);
}
?>
3.需要根据给定点问题给出答案的，适用于留言
<?php
session_start();
function getCode ($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;
$_SESSION[$_GET['Action']]=md5(strtoupper($Total));
createAuthNumImg($Passport,$_GET['imgW'],$_GET['imgH'],"./verdana.ttf");
?>
