检查一下自己的php是不是打开了gd库。
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<?php
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if(extension_loaded('gd')) {
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echo '你可以使用gd
';
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foreach(gd_info() as $cate=>$value)
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echo "$cate: $value
";
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}else
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echo
如果有返回信息就正确可以常用使用了
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<?php
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/**
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* vCode(m,n,x,y) m个数字 显示大小为n 边宽x 边高y
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* 自己改写记录session $code
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*/
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session_start();
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vCode(4, 15); //4个数字,显示大小为15
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function vCode($num = 4, $size = 20, $width = 0, $height = 0) {
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!$width && $width = $num * $size * 4 / 5 + 5;
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!$height && $height = $size + 10;
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// 去掉了 0 1 O l 等
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$str = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKLMNPQRSTUVW";
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$code = '';
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for ($i = 0; $i < $num; $i++) {
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$code .= $str[mt_rand(0, strlen($str)-1)];
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}
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// 画图像
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$im = imagecreatetruecolor($width, $height);
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// 定义要用到的颜色
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$back_color = imagecolorallocate($im, 235, 236, 237);
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$boer_color = imagecolorallocate($im, 118, 151, 199);
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$text_color = imagecolorallocate($im, mt_rand(0, 200), mt_rand(0, 120), mt_rand(0, 120));
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// 画背景
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imagefilledrectangle($im, 0, 0, $width, $height, $back_color);
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// 画边框
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imagerectangle($im, 0, 0, $width-1, $height-1, $boer_color);
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// 画干扰线
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for($i = 0;$i < 5;$i++) {
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$font_color = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
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imagearc($im, mt_rand(- $width, $width), mt_rand(- $height, $height), mt_rand(30, $width * 2), mt_rand(20, $height * 2), mt_rand(0, 360), mt_rand(0, 360), $font_color);
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}
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// 画干扰点
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for($i = 0;$i < 50;$i++) {
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$font_color = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
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imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $font_color);
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}
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// 画验证码
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@imagefttext($im, $size , 0, 5, $size + 3, $text_color, 'c:\WINDOWS\Fonts\simsun.ttc', $code);
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$_SESSION["VerifyCode"]=$code;
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header("Cache-Control: max-age=1, s-maxage=1, no-cache, must-revalidate");
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header("Content-type: image/png;charset=gb2312");
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imagepng($im);
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imagedestroy($im);
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}
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?>
使用PHP,结合session和GD库扩展开发的一个生成验证码的例子(w3c推荐),可以很方便的用于项目中。而且样式美观
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//首先开启session
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session_start();
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//定义前台显示验证码长&宽
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$image_width = 120;
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$image_height = 40;
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$characters_on_image = 6;
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$font = './monofont.ttf';
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//The characters that can be used in the CAPTCHA code.
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//avoid confusing characters (l 1 and i for example)
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$possible_letters = '23456789bcdfghjkmnpqrstvwxyz';
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$random_dots = 10;
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$random_lines = 30;
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$captcha_text_color="0x142864";
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$captcha_noice_color = "0x142864";
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//定义要生成验证码的字符串
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$code = '';
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$i = 0;
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while ($i < $characters_on_image) {
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$code .= substr($possible_letters, mt_rand(0, strlen($possible_letters)-1), 1);
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$i++;
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}
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$font_size = $image_height * 0.75;
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$image = @imagecreate($image_width, $image_height);
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/* setting the background, text and noise colours here */
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$background_color = imagecolorallocate($image, 255, 255, 255);
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$arr_text_color = hexrgb($captcha_text_color);
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$text_color = imagecolorallocate($image, $arr_text_color['red'],
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$arr_text_color['green'], $arr_text_color['blue']);
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$arr_noice_color = hexrgb($captcha_noice_color);
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$image_noise_color = imagecolorallocate($image, $arr_noice_color['red'],
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$arr_noice_color['green'], $arr_noice_color['blue']);
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/* generating the dots randomly in background */
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for( $i=0; $i<$random_dots; $i++ ) {
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imagefilledellipse($image, mt_rand(0,$image_width),
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mt_rand(0,$image_height), 2, 3, $image_noise_color);
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}
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/* generating lines randomly in background of image */
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for( $i=0; $i<$random_lines; $i++ ) {
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imageline($image, mt_rand(0,$image_width), mt_rand(0,$image_height),
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mt_rand(0,$image_width), mt_rand(0,$image_height), $image_noise_color);
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}
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http://www.unitymanual.com/forum.php unity3d论坛
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/* create a text box and add 6 letters code in it */
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$textbox = imagettfbbox($font_size, 0, $font, $code);
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$x = ($image_width - $textbox[4])/2;
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$y = ($image_height - $textbox[5])/2;
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imagettftext($image, $font_size, 0, $x, $y, $text_color, $font , $code);
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/* Show captcha image in the page html page */
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header('Content-Type: image/jpeg');// defining the image type to be shown in browser widow
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imagejpeg($image);//showing the image
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imagedestroy($image);//destroying the image instance
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//设置session,做验证
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$_SESSION['6_letters_code'] = $code;
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function hexrgb ($hexstr)
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{
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$int = hexdec($hexstr);
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return array("red" => 0xFF & ($int >> 0x10),
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"green" => 0xFF & ($int >> 0x8),
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"blue" => 0xFF & $int);
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}
个人推荐推荐第二个生成验证码程序代码,各位同学可尝试参考对比哦,最后一个是W3C标准生成的也是利用了php gd库。
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