captcha_pi.php File Reference

Go to the source code of this file.

Functions
	create_captcha ($data= '', $img_path= '', $img_url= '', $font_path= '')
	|========================================================== | Create Captcha |========================================================== |

---

Function Documentation

create_captcha	(	$	data = '',
		$	img_path = '',
		$	img_url = '',
		$	font_path = ''
	)

|========================================================== | Create Captcha |========================================================== |

Definition at line 154 of file captcha_pi.php.

References is_really_writable().

{               
        $defaults = array('word' => '', 'img_path' => '', 'img_url' => '', 'img_width' => '150', 'img_height' => '30', 'font_path' => '', 'expiration' => 7200);                
        
        foreach ($defaults as $key => $val)
        {
                if ( ! is_array($data))
                {
                        if ( ! isset($$key) OR $$key == '')
                        {
                                $$key = $val;
                        }
                }
                else
                {                       
                        $$key = ( ! isset($data[$key])) ? $val : $data[$key];
                }
        }
        
        if ($img_path == '' OR $img_url == '')
        {
                return FALSE;
        }

        if ( ! @is_dir($img_path))
        {
                return FALSE;
        }
        
        if ( ! is_really_writable($img_path))
        {
                return FALSE;
        }
                        
        if ( ! extension_loaded('gd'))
        {
                return FALSE;
        }               
        
        // -----------------------------------
        // Remove old images    
        // -----------------------------------
                        
        list($usec, $sec) = explode(" ", microtime());
        $now = ((float)$usec + (float)$sec);
                        
        $current_dir = @opendir($img_path);
        
        while($filename = @readdir($current_dir))
        {
                if ($filename != "." and $filename != ".." and $filename != "index.html")
                {
                        $name = str_replace(".jpg", "", $filename);
                
                        if (($name + $expiration) < $now)
                        {
                                @unlink($img_path.$filename);
                        }
                }
        }
        
        @closedir($current_dir);

        // -----------------------------------
        // Do we have a "word" yet?
        // -----------------------------------
        
   if ($word == '')
   {
                $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

                $str = '';
                for ($i = 0; $i < 8; $i++)
                {
                        $str .= substr($pool, mt_rand(0, strlen($pool) -1), 1);
                }
                
                $word = $str;
   }
        
        // -----------------------------------
        // Determine angle and position 
        // -----------------------------------
        
        $length = strlen($word);
        $angle  = ($length >= 6) ? rand(-($length-6), ($length-6)) : 0;
        $x_axis = rand(6, (360/$length)-16);                    
        $y_axis = ($angle >= 0 ) ? rand($img_height, $img_width) : rand(6, $img_height);
        
        // -----------------------------------
        // Create image
        // -----------------------------------
                        
        // PHP.net recommends imagecreatetruecolor(), but it isn't always available
        if (function_exists('imagecreatetruecolor'))
        {
                $im = imagecreatetruecolor($img_width, $img_height);
        }
        else
        {
                $im = imagecreate($img_width, $img_height);
        }
                        
        // -----------------------------------
        //  Assign colors
        // -----------------------------------
        
        $bg_color               = imagecolorallocate ($im, 255, 255, 255);
        $border_color   = imagecolorallocate ($im, 153, 102, 102);
        $text_color             = imagecolorallocate ($im, 204, 153, 153);
        $grid_color             = imagecolorallocate($im, 255, 182, 182);
        $shadow_color   = imagecolorallocate($im, 255, 240, 240);

        // -----------------------------------
        //  Create the rectangle
        // -----------------------------------
        
        ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color);
        
        // -----------------------------------
        //  Create the spiral pattern
        // -----------------------------------
        
        $theta          = 1;
        $thetac         = 7;
        $radius         = 16;
        $circles        = 20;
        $points         = 32;

        for ($i = 0; $i < ($circles * $points) - 1; $i++)
        {
                $theta = $theta + $thetac;
                $rad = $radius * ($i / $points );
                $x = ($rad * cos($theta)) + $x_axis;
                $y = ($rad * sin($theta)) + $y_axis;
                $theta = $theta + $thetac;
                $rad1 = $radius * (($i + 1) / $points);
                $x1 = ($rad1 * cos($theta)) + $x_axis;
                $y1 = ($rad1 * sin($theta )) + $y_axis;
                imageline($im, $x, $y, $x1, $y1, $grid_color);
                $theta = $theta - $thetac;
        }

        // -----------------------------------
        //  Write the text
        // -----------------------------------
        
        $use_font = ($font_path != '' AND file_exists($font_path) AND function_exists('imagettftext')) ? TRUE : FALSE;
                
        if ($use_font == FALSE)
        {
                $font_size = 5;
                $x = rand(0, $img_width/($length/3));
                $y = 0;
        }
        else
        {
                $font_size      = 16;
                $x = rand(0, $img_width/($length/1.5));
                $y = $font_size+2;
        }

        for ($i = 0; $i < strlen($word); $i++)
        {
                if ($use_font == FALSE)
                {
                        $y = rand(0 , $img_height/2);
                        imagestring($im, $font_size, $x, $y, substr($word, $i, 1), $text_color);
                        $x += ($font_size*2);
                }
                else
                {               
                        $y = rand($img_height/2, $img_height-3);
                        imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_path, substr($word, $i, 1));
                        $x += $font_size;
                }
        }
        

        // -----------------------------------
        //  Create the border
        // -----------------------------------

        imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $border_color);          

        // -----------------------------------
        //  Generate the image
        // -----------------------------------
        
        $img_name = $now.'.jpg';

        ImageJPEG($im, $img_path.$img_name);
        
        $img = "<img src=\"$img_url$img_name\" width=\"$img_width\" height=\"$img_height\" style=\"border:0;\" alt=\" \" />";
        
        ImageDestroy($im);
                
        return array('word' => $word, 'time' => $now, 'image' => $img);
}

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