我们在实际开发中，会用到短信验证码以及网页验证码，相对来说网页验证码的成本比较低，安全系数也还可以，接下来我们就来做一个网页端的验证码，直接上代码：
首先来说一下文件目录结构：
|----------phpyanzheng 项目文件夹
|----fonttype 文件夹放字体文件，字体文件一般以 .ttf和.otf结尾
|----1.php 里面放php语言代码
|----index.html 里面放网页布局
1.php
<?php header("content-type:image/jpeg");//定义一下代码以jpeg文件来解析 $width = 120;//定义了图像的宽 $height = 40;//定义了图像的高 $element = array("q","w","e","r","t","y","u","i","o","p","l","k","j","h","g","f","d","s","a","z","x", "c","v","b","n","m","1","2","3","4","5","6","7","8","9","0","Q","W","E","R","T","Y","U","I","O","P","A" ,"S","D","F","G","H","J","K","L","M","N","B","V","C","X","Z");//定义一个显示文本的数组 $string = ""; for($i=0;$i<4;$i++){ $string.=$element[rand(0,count($element)-1)];//随机产生四个文本目标 } $img = imagecreatetruecolor($width, $height);//设置验证区宽高 $colorBg = imagecolorallocate($img,rand(185,255),rand(185,255),rand(185,255));//产生200-255的随机数 $colorBorder = imagecolorallocate($img,rand(50,100),rand(50,100),rand(50,100));//边框颜色 $colorDian = imagecolorallocate($img,rand(0,100),rand(0,100),rand(0,100));//背景小点的颜色 $colorLine = imagecolorallocate($img,rand(0,255),rand(0,255),rand(0,255)); $colorString = imagecolorallocate($img,rand(20,80),rand(20,80),rand(20,80)); imagefill($img, 0, 0, $colorBg);//设置位置和背景颜色 imagerectangle($img,0,0,$width-1,$height-1,$colorBorder);//画一个边框 for($i=0;$i<200;$i++){//循环出200个干扰点 imagesetpixel($img, rand(0, $width-1), rand(0, $height-1), $colorDian); } for($i=0;$i<round(5);$i++){//循环出5条干扰线 imageline($img,rand(0,$width/2),rand(0,$height/2),rand($width/2,$width),rand($height/2,$height),$colorLine); } //imagestring($img, 4, 0, 0,"a5dg", $colorString); imagettftext($img,25,rand(5, 15),rand(0,40),39,$colorString,"fonttype/PrincetownStd.otf",$string); // 图像名称 字体大小 倾斜角度 起始位置X轴 起始位置Y轴 颜色 字体位置 显示的内容 imagejpeg($img);//输出图像?>index.html
<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title>孙三峰--验证码</title> <script type="text/javascript" src="js/jquery-1.1.0.js" ></script> </head> <body> <!--注意：原文中对应的ip地址是自己电脑端ip，如果不能正常运行，请修改ip--> <p> <label class="lbright">验证码：</label> <span> <input type="text" name="validcode" style="width:70px; vertical-align:middle;" id="validcode"/> <img id="codePic" src="http://192.168.1.113:8601/PHP/phpyanzheng/1.php" width="120" height="40"/> </span> <span id="codePic" onclick="getPic();">看不清楚，换一张</span> <!----> </p> </body> <script type="text/javascript"> function getPic(){ $("#codePic").attr("src","http://192.168.1.113:8601/PHP/phpyanzheng/1.php?flag="+Math.random()); <!--局部刷新--> }; </script></html>以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持网页设计。
