This article mainly introduces examples of imitating ecshop verification codes in PHP. It is very good and has reference value. Friends in need can refer to it
The code for imitating ecshop verification codes is as follows:
<?php //仿制ecshop验证码(四位大写字母和数字、背景) //处理码值(四位大写字母和数字组成) //所有的可能的字符集合 $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; $chars_len = strlen($chars); //集合长度 //随机选取 $code_len = 4;//验证码长度 $code=''; //验证码值初始化 for($i=0;$i<$code_len;++$i){ //随机取得一个字符下标 $rand_index = mt_rand(0,$chars_len-1); //利用字符串的下标操做,获得选择的字符 $code .= $chars[$rand_index]; } //echo $code; //存储于session中(用于校验) session_start(); $_SESSION['code'] = $code; //验证码图像(已知的背景图片) //处理背景 $bg_file= './captcha/captcha_bg' . mt_rand(1,5). '.jpg'; //依据该图片,创建画布 $image = imagecreatefromjpeg($bg_file); //简单的将字符串写在画布上的函数(imageString();) //imageString(画布,字体,位置X, 位置y,字符串内容,颜色); //字体:imagestring函数,使用的内置字体。由1-5表示。位置由字符串左上角的坐标决定。颜色也是需要预先分配好的。imagecolorallocate(); //分配字体颜色(随机分配黑色或者白色) if(mt_rand(0,1)==1){ $str_color = imagecolorallocate($image,0,0,0); //黑色 }else{ $str_color = imagecolorallocate($image,255,0xff,255);//白色 } //内置5号字体 $font = 5; //位置 //画布大小 $image_w = imagesx($image); $image_h = imagesy($image); //获得字体的宽和高 $font_w = imagefontwidth($font); $font_h = imagefontheight($font); //获得字符串的宽高 $str_w = $font_w * $code_len; $str_h = $font_h; //计算位置 $str_x = ($image_w-$str_w) / 2; $str_y = ($image_h-$str_h) / 2; //字符串 imagestring($image,$font,$str_x,$str_y,$code,$str_color); //输出和销毁画布 header("content-type:image/jpeg"); imagejpeg($image); imagedestroy($image);
Encapsulation verification code tool class:
//验证码工具类(将所有和验证码操作相关的全部封装到该类中) class Captcha{ /*生成验证码*/ public function makeImage($code_len=4){ //仿制ecshop验证码(四位大写字母和数字、背景) //处理码值(四位大写字母和数字组成) //所有的可能的字符集合 $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; $chars_len = strlen($chars); //集合长度 //随机选取 $code=''; //验证码值初始化 for($i=0;$i<$code_len;++$i){ //随机取得一个字符下标 $rand_index = mt_rand(0,$chars_len-1); //利用字符串的下标操做,获得选择的字符 $code .= $chars[$rand_index]; } //echo $code; //存储于session中(用于校验) @session_start(); $_SESSION['code'] = $code; //验证码图像(已知的背景图片) //处理背景 $bg_file= TOOL . './captcha/captcha_bg' . mt_rand(1,5). '.jpg'; //依据该图片,创建画布 $image = imagecreatefromjpeg($bg_file); //简单的将字符串写在画布上的函数(imageString();) //imageString(画布,字体,位置X, 位置y,字符串内容,颜色); //字体:imagestring函数,使用的内置字体。由1-5表示。位置由字符串左上角的坐标决定。颜色也是需要预先分配好的。imagecolorallocate(); //分配字体颜色(随机分配黑色或者白色) if(mt_rand(0,1)==1){ $str_color = imagecolorallocate($image,0,0,0); //黑色 }else{ $str_color = imagecolorallocate($image,255,0xff,255);//白色 } //内置5号字体 $font = 5; //位置 //画布大小 $image_w = imagesx($image); $image_h = imagesy($image); //获得字体的宽和高 $font_w = imagefontwidth($font); $font_h = imagefontheight($font); //获得字符串的宽高 $str_w = $font_w * $code_len; $str_h = $font_h; //计算位置 $str_x = ($image_w-$str_w) / 2; $str_y = ($image_h-$str_h) / 2; //字符串 imagestring($image,$font,$str_x,$str_y,$code,$str_color); //输出和销毁画布 header("content-type:image/jpeg"); imagejpeg($image); imagedestroy($image); } }
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