本文章来给大家介绍php生成雪花背景验证码程序代码 ,有需要的朋友可进入参考参考。
验证码生成程序
<?php session_start(); session_register("login_check_number"); //昨晚看到了chianren上的验证码效果,就考虑了一下,用PHP的GD库完成了类似功能 //先成生背景,再把生成的验证码放上去 $img_height=120; //先定义图片的长、宽 $img_width=40; if($HTTP_GET_VARS["act"]== "init"){ //srand(microtime() * 100000);//PHP420后,srand不是必须的 for($Tmpa=0;$Tmpa<4;$Tmpa++){ $nmsg.=dechex(rand(0,15)); }//by sports98 $HTTP_SESSION_VARS[login_check_number] = $nmsg; //$HTTP_SESSION_VARS[login_check_number] = strval(mt_rand("1111","9999")); //生成4位的随机数,放入session中 //谁能做下补充,可以同时生成字母和数字啊??----由sports98完成了 $aimg = imageCreate($img_height,$img_width); //生成图片 ImageColorAllocate($aimg, 255,255,255); //图片底色,ImageColorAllocate第1次定义颜色PHP就认为是底色了 $black = ImageColorAllocate($aimg, 0,0,0); //定义需要的黑色 ImageRectangle($aimg,0,0,$img_height-1,$img_width-1,$black);//先成一黑色的矩形把图片包围 //下面该生成雪花背景了,其实就是在图片上生成一些符号 for ($i=1; $i<=100; $i++) { //先用100个做测试 imageString($aimg,1,mt_rand(1,$img_height),mt_rand(1,$img_width),"*",imageColorAllocate($aimg,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255))); //哈,看到了吧,其实也不是雪花,就是生成*号而已。为了使它们看起来"杂乱无章、5颜6色",就得在1个1个生成它们的时候,让它们的位置、颜色,甚至大小都用随机数,rand()或mt_rand都可以完成。 } //上面生成了背景,现在就该把已经生成的随机数放上来了。道理和上面差不多,随机数1个1个地放,同时让他们的位置、大小、颜色都用成随机数~~ //为了区别于背景,这里的颜色不超过200,上面的不小于200 for ($i=0;$i<strlen($HTTP_SESSION_VARS[login_check_number]);$i++){ imageString($aimg, mt_rand(3,5),$i*$img_height/4+mt_rand(1,10),mt_rand(1,$img_width/2), $HTTP_SESSION_VARS[login_check_number][$i],imageColorAllocate($aimg,mt_rand(0,100),mt_rand(0,150),mt_rand(0,200))); } Header("Content-type: image/png"); //告诉浏览器,下面的数据是图片,而不要按文字显示 ImagePng($aimg); //生成png格式。 ImageDestroy($aimg); } ?>
验证测试页面
<?session_start();?> <FORM METHOD=POST ACTION=""> <input type=text name=number maxlength=4><img src="YanZhengMa.php?act=init"> <INPUT TYPE="submit" name="sub"> </FORM> <? //检验校验码 if(isset($HTTP_POST_VARS["sub"])): if($HTTP_POST_VARS["number"] != $HTTP_SESSION_VARS[login_check_number] || empty($HTTP_POST_VARS["number"])){ echo "校验码不正确!" ; }else{ echo"验证码通过!"; } endif; show_source('test.php'); //以上本页的源码 //以下是生成验证码的源码 show_source('YanZhengMa.php'); ?>
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