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plugin/kcaptcha/kcaptcha_config.php

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+<?php
+
+# KCAPTCHA configuration file
+
+$alphabet = "0123456789abcdefghijklmnopqrstuvwxyz"; # do not change without changing font files!
+
+# symbols used to draw CAPTCHA
+$allowed_symbols = "0123456789"; #digits
+//$allowed_symbols = "0123456789abcdef"; #digits // 스캔 방지를 위하여 abcdef 추가 151029 15:00
+//$allowed_symbols = "abcdeghkmnpqsuvxyz"; #digits
+//$allowed_symbols = "23456789abcdeghkmnpqsuvxyz"; #alphabet without similar symbols (o=0, 1=l, i=j, t=f)
+
+# folder with fonts
+$fontsdir = 'fonts';
+
+# CAPTCHA string length
+//$length = mt_rand(5,6); # random 5 or 6
+$length = 6;
+
+# CAPTCHA image size (you do not need to change it, whis parameters is optimal)
+$width = 160;
+$height = 60;
+
+# symbol's vertical fluctuation amplitude divided by 2
+//$fluctuation_amplitude = 5;
+//$fluctuation_amplitude = 11; // 파동&진폭 151028 14:00
+$fluctuation_amplitude = 5; // 파동&진폭 원래대로 151029 15:00
+
+#noise
+//$white_noise_density=0; // no white noise
+$white_noise_density=1/6;
+//$black_noise_density=0; // no black noise
+$black_noise_density=1/20;
+
+# increase safety by prevention of spaces between symbols
+$no_spaces = false;
+
+# show credits
+$show_credits = false; # set to false to remove credits line. Credits adds 12 pixels to image height
+$credits = 'www.captcha.ru'; # if empty, HTTP_HOST will be shown
+
+# CAPTCHA image colors (RGB, 0-255)
+$foreground_color = array(0, 0, 0);
+$background_color = array(255, 255, 255);
+//$foreground_color = array(mt_rand(0,100), mt_rand(0,100), mt_rand(0,100));
+//$background_color = array(mt_rand(200,255), mt_rand(200,255), mt_rand(200,255));
+
+# JPEG quality of CAPTCHA image (bigger is better quality, but larger file size)
+$jpeg_quality = 90;
+
+$wave = true;