[Astrospaces-commits] SF.net SVN: astrospaces: [80] trunk/functions/captcha.php

[<p3...@us...>]

Revision: 80
          http://astrospaces.svn.sourceforge.net/astrospaces/?rev=80&view=rev
Author:   p3net
Date:     2007-07-30 23:36:53 -0700 (Mon, 30 Jul 2007)

Log Message:
-----------
A VERY basic CAPTCHA model

Added Paths:
-----------
    trunk/functions/captcha.php

Added: trunk/functions/captcha.php
===================================================================
--- trunk/functions/captcha.php	                        (rev 0)
+++ trunk/functions/captcha.php	2007-07-31 06:36:53 UTC (rev 80)
@@ -0,0 +1,74 @@
+<?php
+/*******************************************************
+ *   Copyright (C) 2007  http://p3net.net
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+    
+    @id: $Id$
+*********************************************************/
+class captcha
+{
+	function generate()
+	{
+		header('Content-type: image/png');
+		$chars = "abcdefghijklmnopqrstuvwxyz";
+		$chars .= strtoupper($chars) . "123456789";
+		
+		$phrase = array();
+		$rotate = array();
+		$i=0;
+		while($i<7)
+		{
+			$num = rand(1,(26+26+9)-1);
+			$phrase[$i] = substr($chars, $num, 1);
+			$rotate[$i] = rand(-45, 45);
+			$i++;
+		}
+		$width = "200";
+		$height = "50";
+		
+		$cap = ImageCreateTrueColor($width, $height);
+		$white = ImageColorAllocate($cap, 255, 255, 255);
+		$black = ImageColorAllocate($cap, 0, 0, 0);
+		$color = array(
+			'red' => ImageColorAllocate($cap, 255, 0, 0),
+			'green' => ImageColorAllocate($cap, 0, 255, 0),
+			'blue' => ImageColorAllocate($cap, 0, 0, 255)
+		);
+		ImageFillToBorder($cap, 0, 0, $white, $white);
+		
+		/* Let's create between 3 and 6 lines */
+		$line_count = rand(3, 6);
+		$a=0;
+		while($a < $line_count)
+		{
+			$col = rand(0, count($color)-1);
+			$col = $color[$col];
+			ImageLine($cap, rand(0, $width-100), rand(0, $height - 20), rand($width-100, $width), rand($height-20, $height), $col);
+			$a++;
+		}
+		/* Letters */
+		$i=0;
+		while($i < 7)
+		{
+			imagestring($cap, 31, 8*$i, 12*$1, $phrase[$i], $black);
+			$i++;
+		}
+		
+		ImagePNG($cap);
+		imageDestroy($cap);
+	}
+}
+?>
\ No newline at end of file


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