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<?php // // A simple PHP CAPTCHA script // // Copyright 2013 by Cory LaViska for A Beautiful Site, LLC. // // See readme.md for usage, demo, and licensing info // function simple_php_captcha($config = array()) { // Check for GD library if( !function_exists('gd_info') ) { throw new Exception('Required GD library is missing'); } $bg_path = dirname(__FILE__) . '/backgrounds/'; $font_path = dirname(__FILE__) . '/fonts/'; // Default values $captcha_config = array( 'code' => '', 'min_length' => 5, 'max_length' => 5, 'backgrounds' => array( $bg_path . '45-degree-fabric.png', $bg_path . 'cloth-alike.png', $bg_path . 'grey-sandbag.png', $bg_path . 'kinda-jean.png', $bg_path . 'polyester-lite.png', $bg_path . 'stitched-wool.png', $bg_path . 'white-carbon.png', $bg_path . 'white-wave.png' ), 'fonts' => array( $font_path . 'times_new_yorker.ttf' ), 'characters' => 'ABCDEFGHJKLMNPRSTUVWXYZabcdefghjkmnprstuvwxyz23456789', 'min_font_size' => 28, 'max_font_size' => 28, 'color' => '#666', 'angle_min' => 0, 'angle_max' => 10, 'shadow' => true, 'shadow_color' => '#fff', 'shadow_offset_x' => -1, 'shadow_offset_y' => 1 ); // Overwrite defaults with custom config values if( is_array($config) ) { foreach( $config as $key => $value ) $captcha_config[$key] = $value; } // Restrict certain values if( $captcha_config['min_length'] < 1 ) $captcha_config['min_length'] = 1; if( $captcha_config['angle_min'] < 0 ) $captcha_config['angle_min'] = 0; if( $captcha_config['angle_max'] > 10 ) $captcha_config['angle_max'] = 10; if( $captcha_config['angle_max'] < $captcha_config['angle_min'] ) $captcha_config['angle_max'] = $captcha_config['angle_min']; if( $captcha_config['min_font_size'] < 10 ) $captcha_config['min_font_size'] = 10; if( $captcha_config['max_font_size'] < $captcha_config['min_font_size'] ) $captcha_config['max_font_size'] = $captcha_config['min_font_size']; // Use milliseconds instead of seconds srand(microtime() * 100); // Generate CAPTCHA code if not set by user if( empty($captcha_config['code']) ) { $captcha_config['code'] = ''; $length = rand($captcha_config['min_length'], $captcha_config['max_length']); while( strlen($captcha_config['code']) < $length ) { $captcha_config['code'] .= substr($captcha_config['characters'], rand() % (strlen($captcha_config['characters'])), 1); } } // Generate HTML for image src $image_src = substr(__FILE__, strlen( realpath($_SERVER['DOCUMENT_ROOT']) )) . '?_CAPTCHA&amp;t=' . urlencode(microtime()); $image_src = '/' . ltrim(preg_replace('/\\\\/', '/', $image_src), '/'); $_SESSION['_CAPTCHA']['config'] = serialize($captcha_config); return array( 'code' => $captcha_config['code'], 'image_src' => $image_src ); } if( !function_exists('hex2rgb') ) { function hex2rgb($hex_str, $return_string = false, $separator = ',') { $hex_str = preg_replace("/[^0-9A-Fa-f]/", '', $hex_str); // Gets a proper hex string $rgb_array = array(); if( strlen($hex_str) == 6 ) { $color_val = hexdec($hex_str); $rgb_array['r'] = 0xFF & ($color_val >> 0x10); $rgb_array['g'] = 0xFF & ($color_val >> 0x8); $rgb_array['b'] = 0xFF & $color_val; } elseif( strlen($hex_str) == 3 ) { $rgb_array['r'] = hexdec(str_repeat(substr($hex_str, 0, 1), 2)); $rgb_array['g'] = hexdec(str_repeat(substr($hex_str, 1, 1), 2)); $rgb_array['b'] = hexdec(str_repeat(substr($hex_str, 2, 1), 2)); } else { return false; } return $return_string ? implode($separator, $rgb_array) : $rgb_array; } } // Draw the image if( isset($_GET['_CAPTCHA']) ) { session_start(); $captcha_config = unserialize($_SESSION['_CAPTCHA']['config']); if( !$captcha_config ) exit(); unset($_SESSION['_CAPTCHA']); // Use milliseconds instead of seconds srand(microtime() * 100); // Pick random background, get info, and start captcha $background = $captcha_config['backgrounds'][rand(0, count($captcha_config['backgrounds']) -1)]; list($bg_width, $bg_height, $bg_type, $bg_attr) = getimagesize($background); $captcha = imagecreatefrompng($background); $color = hex2rgb($captcha_config['color']); $color = imagecolorallocate($captcha, $color['r'], $color['g'], $color['b']); // Determine text angle $angle = rand( $captcha_config['angle_min'], $captcha_config['angle_max'] ) * (rand(0, 1) == 1 ? -1 : 1); // Select font randomly $font = $captcha_config['fonts'][rand(0, count($captcha_config['fonts']) - 1)]; // Verify font file exists if( !file_exists($font) ) throw new Exception('Font file not found: ' . $font); //Set the font size. $font_size = rand($captcha_config['min_font_size'], $captcha_config['max_font_size']); $text_box_size = imagettfbbox($font_size, $angle, $font, $captcha_config['code']); // Determine text position $box_width = abs($text_box_size[6] - $text_box_size[2]); $box_height = abs($text_box_size[5] - $text_box_size[1]); $text_pos_x_min = 0; $text_pos_x_max = ($bg_width) - ($box_width); $text_pos_x = rand($text_pos_x_min, $text_pos_x_max); $text_pos_y_min = $box_height; $text_pos_y_max = ($bg_height) - ($box_height / 2); $text_pos_y = rand($text_pos_y_min, $text_pos_y_max); // Draw shadow if( $captcha_config['shadow'] ){ $shadow_color = hex2rgb($captcha_config['shadow_color']); $shadow_color = imagecolorallocate($captcha, $shadow_color['r'], $shadow_color['g'], $shadow_color['b']); imagettftext($captcha, $font_size, $angle, $text_pos_x + $captcha_config['shadow_offset_x'], $text_pos_y + $captcha_config['shadow_offset_y'], $shadow_color, $font, $captcha_config['code']); } // Draw text imagettftext($captcha, $font_size, $angle, $text_pos_x, $text_pos_y, $color, $font, $captcha_config['code']); // Output image header("Content-type: image/png"); imagepng($captcha); }