所属分类:常用实例教程
1、HTML代码
<div class="cont"> <div class="yzm"> <h3>1、数字验证码</h3> <p>验证码:<input type="text" class="input" id="code_num" name="code_num" maxlength="4" /> <img src="code_num.php" id="getcode_num" title="看不清,点击换一张" align="absmiddle"></p> <p><input type="button" class="btn" id="chk_num" value="提交" /></p> </div> <div class="yzm"> <h3>2、数字+字母验证码</h3> <p>验证码:<input type="text" class="input" id="code_char" maxlength="4" /> <img src="code_char.php" id="getcode_char" title="看不清,点击换一张" align="absmiddle"></p> <p><input type="button" class="btn" id="chk_char" value="提交" /></p> </div> <div class="yzm"> <h3>3、中文验证码</h3> <p>验证码:<input type="text" class="input" id="code_zh" maxlength="4" /> <img src="code_zh.php" id="getcode_zh" title="看不清,点击换一张" align="absmiddle"></p> <p><input type="button" class="btn" id="chk_zh" value="提交" /></p> </div> <div class="yzm"> <h3>4、仿google验证码</h3> <p>验证码:<input type="text" class="input" id="code_gg" maxlength="4" /> <img src="code_gg.php" id="getcode_gg" title="看不清,点击换一张" align="absmiddle"></p> <p><input type="button" class="btn" id="chk_gg" value="提交" /></p> </div> <div class="yzm"> <h3>5、算术验证码</h3> <p>验证码:<input type="text" class="input" id="code_math" maxlength="4" /> <img src="code_math.php" id="getcode_math" title="看不清,点击换一张" align="absmiddle"></p> <p><input type="button" class="btn" id="chk_math" value="提交" /></p> </div> </div>
2、JS代码
<script src="js/jquery.min.js"></script> <script type="text/javascript"> $(function() { //数字验证 $("#getcode_num").click(function() { $(this).attr("src", 'code_num.php?' + Math.random()); }); $("#chk_num").click(function() { var code_num = $("#code_num").val(); $.post("chk_code.php?act=num", {code: code_num}, function(msg) { if (msg == 1) { alert("验证码正确!"); } else { alert("验证码错误!"); } }); }); //数字+字母验证 $("#getcode_char").click(function() { $(this).attr("src", 'code_char.php?' + Math.random()); }); $("#chk_char").click(function() { var code_char = $("#code_char").val(); $.post("chk_code.php?act=char", {code: code_char}, function(msg) { if (msg == 1) { alert("验证码正确!"); } else { alert("验证码错误!"); } }); }); //中文验证码 $("#getcode_zh").click(function() { $(this).attr("src", 'code_zh.php?' + Math.random()); }); $("#chk_zh").click(function() { var code_zh = escape($("#code_zh").val()); $.post("chk_code.php?act=zh", {code: code_zh}, function(msg) { if (msg == 1) { alert("验证码正确!"); } else { alert("验证码错误!"); } }); }); //google验证 $("#getcode_gg").click(function() { $(this).attr("src", 'code_gg.php?' + Math.random()); }); $("#chk_gg").click(function() { var code_gg = $("#code_gg").val(); $.post("chk_code.php?act=gg", {code: code_gg}, function(msg) { if (msg == 1) { alert("验证码正确!"); } else { alert("验证码错误!"); } }); }); //算术验证 $("#getcode_math").click(function() { $(this).attr("src", 'code_math.php?' + Math.random()); }); $("#chk_math").click(function() { var code_math = $("#code_math").val(); $.post("chk_code.php?act=math", {code: code_math}, function(msg) { if (msg == 1) { alert("验证码正确!"); } else { alert("验证码错误!"); } }); }); }); </script>
3、PHP生成验证码
session_start(); getCode(4,60,20); function getCode($num,$w,$h) { $code = ""; for ($i = 0; $i < $num; $i++) { $code .= rand(0, 9); } //4位验证码也可以用rand(1000,9999)直接生成 //将生成的验证码写入session,备验证时用 $_SESSION["helloweba_num"] = $code; //创建图片,定义颜色值 header("Content-type: image/PNG"); $im = imagecreate($w, $h); $black = imagecolorallocate($im, 0, 0, 0); $gray = imagecolorallocate($im, 200, 200, 200); $bgcolor = imagecolorallocate($im, 255, 255, 255); //填充背景 imagefill($im, 0, 0, $gray); //画边框 imagerectangle($im, 0, 0, $w-1, $h-1, $black); //随机绘制两条虚线,起干扰作用 $style = array ($black,$black,$black,$black,$black, $gray,$gray,$gray,$gray,$gray ); imagesetstyle($im, $style); $y1 = rand(0, $h); $y2 = rand(0, $h); $y3 = rand(0, $h); $y4 = rand(0, $h); imageline($im, 0, $y1, $w, $y3, IMG_COLOR_STYLED); imageline($im, 0, $y2, $w, $y4, IMG_COLOR_STYLED); //在画布上随机生成大量黑点,起干扰作用; for ($i = 0; $i < 80; $i++) { imagesetpixel($im, rand(0, $w), rand(0, $h), $black); } //将数字随机显示在画布上,字符的水平间距和位置都按一定波动范围随机生成 $strx = rand(3, 8); for ($i = 0; $i < $num; $i++) { $strpos = rand(1, 6); imagestring($im, 5, $strx, $strpos, substr($code, $i, 1), $black); $strx += rand(8, 12); } imagepng($im);//输出图片 imagedestroy($im);//释放图片所占内存 }
4、判断验证码的正确性
session_start(); $action = $_GET['act']; $code = trim($_POST['code']); if($action=='num'){ //检验数字验证码 if($code==$_SESSION["helloweba_num"]){ echo '1'; } }elseif($action=='char'){ if($code==$_SESSION["helloweba_char"]){ echo '1'; } }elseif($action=='zh'){ $code = uniDecode($code,'utf-8'); $ses = iconv('gbk','utf-8',$_SESSION["helloweba_zh"]); if($code==$ses){ echo '1'; } }elseif($action=='gg'){ //echo $_SESSION["helloweba_gg"];exit; if(strtolower($code)==$_SESSION["helloweba_gg"]){ echo '1'; } }elseif($action=='math'){ if($code==$_SESSION["helloweba_math"]){ echo '1'; } }else{ } //处理接收中文字符串 function uniDecode($str, $charcode) { $text = preg_replace_callback("/%u[0-9A-Za-z]{4}/", toUtf8, $str); return mb_convert_encoding($text, $charcode, 'utf-8'); } function toUtf8($ar) { foreach ($ar as $val) { $val = intval(substr($val, 2), 16); if ($val < 0x7F) { // 0000-007F $c .= chr($val); } elseif ($val < 0x800) { // 0080-0800 $c .= chr(0xC0 | ($val / 64)); $c .= chr(0x80 | ($val % 64)); } else { // 0800-FFFF $c .= chr(0xE0 | (($val / 64) / 64)); $c .= chr(0x80 | (($val / 64) % 64)); $c .= chr(0x80 | ($val % 64)); } } return $c; }
PHP GD库图像处理函数说明:
参数 | 描述 | 默认值 |
imagecreate() | 创建一个新图像 | - |
imagecolorallocate() | 为图像分配颜色 | - |
imagefill() | 填充图像 | - |
imagerectangle() | 画一个矩形(边框) | - |
imagesetstyle() | 设置画线风格 | - |
imageline() | 画一条线段 | - |
imagesetpixel() | 画点像素 | - |
imagepng() | 以PNG格式将图像输出到浏览器或文件 | - |
imagedestroy() | 释放图片所占内存 | - |