php仿QQ验证码的实例分析

2020-01-24 07:53栏目:bob体育平台
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有亟待的心上人,参谋下呢。 复制代码 代码如下: 5卡塔尔卡塔尔国{ $_SESSION['dd_ckstr'] = strtolower; $_SESSION['dd_ckstr_last'] = $ntime;}$rndstring = $_SESSION['dd_ckstr'];$rndcodelen = strlen;//成立图片,并设置背景象$im = imagecreate;ImageColorAllocate;//烦懑线$lineColor1 = ImageColorAllocate,mt_rand,mt_rand;for{ imageline($im,0,$j+mt_rand,48,$j+mt_rand;}//输出文字$fontColor = ImageColorAllocate,mt_rand);for($i=0;$i jpg ->pngif(function_exists{ header("content-type:image/png"r"n"卡塔尔(قطر‎; imagepng;}else{ header("content-type:image/jpeg"r"n"State of Qatar; imagejpeg;}ImageDestroy;}else{//不扶助GD,只输出字母 ABCD$_SESSION['dd_ckstr'] = "abcd";$_SESSION['dd_ckstr_last'] = ''; header("content-type:image/png"r"n");header("Pragma:no-cache"r"n");header("Cache-Control:no-cache"r"n");header;$fp = fopen("data/vdcode.jpg","r");echo fread($fp,filesize;fclose;}?>

 

有亟待的心上人,仿效下啊。
复制代码 代码如下:
/**
 * 仿QQ验证码
*/
//Session保存路线
$sessSavePath = dirname(apizl_file)."/../data/sessions/";
if(is_writeable($sessSavePath) && is_readable($sessSavePath)){ session_save_path($sessSavePath); }
session_start();
//获取随机字符
$rndstring = '';
for($i=0; $i<4; $i++) $rndstring .= chr(mt_rand(65,90));
$img_height=45;    //先定义图片的长、宽
$img_width=10;
//就算扶助GD,则绘图
if(function_exists("imagecreate"))
{
 //Firefox部份意况会频仍号召的标题,5秒内刷新页面将不退换session
 $ntime = time();
 if(empty($_SESSION['dd_ckstr_last']) || empty($_SESSION['dd_ckstr']) || ($ntime - $_SESSION['dd_ckstr_last'] > 5))
 {
  $_SESSION['dd_ckstr'] = strtolower($rndstring);
  $_SESSION['dd_ckstr_last'] = $ntime;
 }
 $rndstring = $_SESSION['dd_ckstr'];
 $rndcodelen = strlen($rndstring);
 //创立图片,并设置背景观
 $im = imagecreate(46,20);
 ImageColorAllocate($im, 240,243,248);
 //干扰线
 $lineColor1 = ImageColorAllocate($im, mt_rand(174,218),mt_rand(190,225),mt_rand(217,237));
 for($j=1;$j<=2;$j=$j+3)
 {
  imageline($im,0,$j+mt_rand(1,15),48,$j+mt_rand(1,15),$lineColor1);
 }
 //输出文字
 $fontColor = ImageColorAllocate($im, mt_rand(0,150),mt_rand(0,150),mt_rand(0,150));
 for($i=0;$i {
  $bc = mt_rand(0,1);
  $rndstring[$i] = strtoupper($rndstring[$i]);
  imagestring($im,mt_rand(3,5),$i*$img_height/4+mt_rand(1,5),mt_rand(1,$img_width/2), $rndstring[$i], $fontColor);
 }
 header("Pragma:no-cache"r"n");
 header("Cache-Control:no-cache"r"n");
 header("Expires:0"r"n");
 //输出特定类型的图片格式,优先级为 gif -> jpg ->png
 if(function_exists("imagepng"))
 {
  header("content-type:image/png"r"n");
  imagepng($im);
 }
 else
 {
  header("content-type:image/jpeg"r"n");
  imagejpeg($im);
 }
 ImageDestroy($im);
 exit();
}
else
{
 //不辅助GD,只输出字母 ABCD
 $_SESSION['dd_ckstr'] = "abcd";
 $_SESSION['dd_ckstr_last'] = '';
 header("content-type:image/png"r"n");
 header("Pragma:no-cache"r"n");
 header("Cache-Control:no-cache"r"n");
 header("Expires:0"r"n");
 $fp = fopen("data/vdcode.jpg","r");
 echo fread($fp,filesize("data/vdcode.jpg"));
 fclose($fp);
 exit();
}
?>

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