81 lines
2.7 KiB
PHP
81 lines
2.7 KiB
PHP
<?php
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/*******************************************************************\
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* Exchangerix v2.0
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* http://www.exchangerix.com
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*
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* Copyright (c) 2018 Exchangerix Software. All rights reserved.
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* ---------- Exchangerix IS NOT FREE SOFTWARE ----------
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\*******************************************************************/
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session_start();
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// Captcha Settings
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$image_width = 110;
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$image_height = 35;
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$characters_on_image = 6;
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$font = './inc/futura.ttf';
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$font_size = 18;
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$possible_letters = '23456789bcdfghkmnpqrsvwxyz'; // the characters that can be used in the CAPTCHA code
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$random_dots = 11;
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$random_lines = 10;
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$captcha_text_color = "0x00000";
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$captcha_noice_color = "0x142864";
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$bg = trim($_GET['bg']);
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$code = '';
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$i = 0;
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while ($i < $characters_on_image)
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{
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$code .= substr($possible_letters, mt_rand(0, strlen($possible_letters)-1), 1);
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$i++;
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}
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$image = @imagecreate($image_width, $image_height);
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/* setting the background, text and noise colours here */
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if (!$bg || $bg == "grey")
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$background_color = imagecolorallocate($image, 249, 249, 249);
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else
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$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'], $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'], $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; $i++ )
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{
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imagefilledellipse($image, mt_rand(0,$image_width), mt_rand(0,$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; $i++ )
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{
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imageline($image, mt_rand(0,$image_width), mt_rand(0,$image_height), mt_rand(0,$image_width), mt_rand(0,$image_height), $image_noise_color);
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}
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/* create a text box and add 6 letters code in it */
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$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($image); //destroying the image instance
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$_SESSION['captcha'] = $code;
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function hexrgb ($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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}
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?>
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