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<?php
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/**
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* Create CAPTCHA
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*
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* @access public
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* @param array array of data for the CAPTCHA
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* @param string path to create the image in
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* @param string URL to the CAPTCHA image folder
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* @param string server path to font
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* @link http://codeigniter.com/user_guide/helpers/xml_helper.html
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* @return string
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*/
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function captcha_function($data = '', $img_path = '', $img_url = '', $font_path = '') {
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// The captcha function requires the GD image library.
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// Only the img_path and img_url are required.
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// If a "word" is not supplied, the function will generate a random ASCII string. You might put together your own word library that you can draw randomly from.
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// If you do not specify a path to a TRUE TYPE font, the native ugly GD font will be used.
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// The "captcha" folder must be writable (666, or 777)
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// The "expiration" (in seconds) signifies how long an image will remain in the captcha folder before it will be deleted. The default is two hours.
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$defaults = array(
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'word' => '',
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'img_path' => '',
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'img_url' => '',
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'img_width' => '150',
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'img_height' => '30',
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'font_path' => '',
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'expiration' => 7200
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);
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foreach ($defaults as $key => $val) {
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if ( ! is_array($data)) {
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if ( ! isset($$key) || $$key == '') {
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$$key = $val;
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}
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} else {
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$$key = ( ! isset($data[$key])) ? $val : $data[$key];
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}
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}
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if ($img_path == '' || $img_url == '') {
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return FALSE;
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}
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if ( ! @is_dir($img_path)) {
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return FALSE;
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}
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if ( ! is_writable($img_path)) {
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return FALSE;
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}
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if ( ! extension_loaded('gd')) {
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return FALSE;
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}
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// -----------------------------------
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// Remove old images
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// -----------------------------------
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list($usec, $sec) = explode(" ", microtime());
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$now = ((float)$usec + (float)$sec);
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$current_dir = @opendir($img_path);
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while($filename = @readdir($current_dir)) {
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if ($filename != "." && $filename != ".." && $filename != "index.html") {
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$name = str_replace(".jpg", "", $filename);
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// The expired images will be deleted when this function is called again
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if (($name + $expiration) < $now) {
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@unlink($img_path.$filename);
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}
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}
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}
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@closedir($current_dir);
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// -----------------------------------
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// Do we have a "word" yet?
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// -----------------------------------
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if ($word == '') {
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$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
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$str = '';
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for ($i = 0; $i < 8; $i++) {
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$str .= substr($pool, mt_rand(0, strlen($pool) -1), 1);
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}
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$word = $str;
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}
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// -----------------------------------
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// Determine angle and position
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// -----------------------------------
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$length = strlen($word);
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$angle = ($length >= 6) ? rand(-($length-6), ($length-6)) : 0;
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$x_axis = rand(6, (360/$length)-16);
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$y_axis = ($angle >= 0 ) ? rand($img_height, $img_width) : rand(6, $img_height);
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// -----------------------------------
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// Create image
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// -----------------------------------
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// PHP.net recommends imagecreatetruecolor(), but it isn't always available
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if (function_exists('imagecreatetruecolor')) {
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$im = imagecreatetruecolor($img_width, $img_height);
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} else {
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$im = imagecreate($img_width, $img_height);
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}
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// -----------------------------------
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// Assign colors
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// -----------------------------------
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$bg_color = imagecolorallocate ($im, 255, 255, 255);
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$border_color = imagecolorallocate ($im, 153, 102, 102);
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$text_color = imagecolorallocate ($im, 204, 153, 153);
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$grid_color = imagecolorallocate($im, 255, 182, 182);
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$shadow_color = imagecolorallocate($im, 255, 240, 240);
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// -----------------------------------
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// Create the rectangle
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// -----------------------------------
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ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color);
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// -----------------------------------
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// Create the spiral pattern
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// -----------------------------------
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$theta = 1;
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$thetac = 7;
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$radius = 16;
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$circles = 20;
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$points = 32;
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for ($i = 0; $i < ($circles * $points) - 1; $i++) {
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$theta = $theta + $thetac;
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$rad = $radius * ($i / $points );
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$x = ($rad * cos($theta)) + $x_axis;
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$y = ($rad * sin($theta)) + $y_axis;
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$theta = $theta + $thetac;
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$rad1 = $radius * (($i + 1) / $points);
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$x1 = ($rad1 * cos($theta)) + $x_axis;
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$y1 = ($rad1 * sin($theta )) + $y_axis;
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imageline($im, $x, $y, $x1, $y1, $grid_color);
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$theta = $theta - $thetac;
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}
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// -----------------------------------
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// Write the text
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// -----------------------------------
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$use_font = ($font_path != '' && file_exists($font_path) && function_exists('imagettftext')) ? TRUE : FALSE;
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if ($use_font == FALSE) {
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$font_size = 5;
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$x = rand(0, $img_width/($length/3));
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$y = 0;
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} else {
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$font_size = 16;
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$x = rand(0, $img_width/($length/1.5));
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$y = $font_size+2;
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}
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for ($i = 0; $i < strlen($word); $i++) {
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if ($use_font == FALSE) {
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$y = rand(0 , $img_height/2);
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imagestring($im, $font_size, $x, $y, substr($word, $i, 1), $text_color);
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$x += ($font_size*2);
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} else {
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$y = rand($img_height/2, $img_height-3);
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imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_path, substr($word, $i, 1));
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$x += $font_size;
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}
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}
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// -----------------------------------
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// Create the border
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// -----------------------------------
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imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $border_color);
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// -----------------------------------
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// Generate the image
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// -----------------------------------
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$img_name = $now.'.jpg';
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ImageJPEG($im, $img_path.$img_name);
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$img = "<img src=\"$img_url$img_name\" width=\"$img_width\" height=\"$img_height\" style=\"border:0;\" alt=\" \" />";
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ImageDestroy($im);
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return array(
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'word' => $word,
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'time' => $now,
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'image' => $img
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);
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}
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/* End of file: ./system/functions/captcha_function.php */
Page URI: http://www.infopotato.com/index.php/code/function/captcha/