/
class.captcha_numbers.php
executable file
·144 lines (122 loc) · 3.42 KB
/
class.captcha_numbers.php
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<?php
/*
* Captcha File
* Generates CAPRCHA Numbers Image
* @author Hadar Porat <hpman28@gmail.com>
* @version 1.5
* GNU General Public License (Version 2, June 1991)
*
* 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.
*/
/**
* CaptchaNumbers Class
* @access public
* @author Hadar Porat <hpman28@gmail.com>
* @version 1.51
*/
class CaptchaNumbers {
var $length = 6;
var $font = 'verdana';
var $size = 22;
var $type = 'png';
var $height = 40;
var $width = 200;
var $grid = 7;
var $string = '';
/**
* @return void
* @param int $length string length
* @param int $size font size
* @param String $type image type
* @desc generate the main image
*/
function CaptchaNumbers($length = '', $size = '', $type = '') {
/*
* make sure that the gd extension is loaded (for graphics)
*/
if(!extension_loaded('gd'))
{
if(strtoupper(substr(PHP_OS,3)) == "WIN"){
dl('php_gd2.dll');
}
else{
dl('gd.so');
}
}
//putenv('GDFONTPATH=' . realpath('.'));
if ($length!='') $this -> length = $length;
if ($size!='') $this -> size = $size;
if ($type!='') $this -> type = $type;
$this -> width = $this -> length * $this -> size + $this -> grid;
$this -> height = $this -> size + (2 * $this -> grid);
$this -> generateString();
}
/**
* @return void
* @desc display captcha image
*/
function display() {
$this -> sendHeader();
$image = $this -> generate();
switch ($this-> type) {
case 'jpeg': imagejpeg($image); break;
case 'png': imagepng($image); break;
case 'gif': imagegif($image); break;
default: imagepng($image); break;
}
}
/**
* @return Image
* @desc generate the image
*/
function generate() {
$image = imagecreate($this -> width, $this -> height) or die("Cannot Initialize new GD image stream");
// colors
$background_color = ImageColorAllocate($image, 254, 254, 239 );
$net_color = ImageColorAllocate($image, 200, 200, 200);
$stringcolor = ImageColorAllocate($image, 0, 0, 0);
// grid
for ($i = $this -> grid; $i < $this -> width; $i+=$this -> grid) ImageLine($image, $i, 0, $i, $this -> height, $net_color);
for ($i = $this -> grid; $i < $this -> height; $i+=$this -> grid) ImageLine($image, 0, $i, $this -> width, $i, $net_color);
// make the text
ImageTTFText($image, $this -> size, 0, $this -> grid, $this -> size + $this -> grid, $stringcolor, $this -> font, $this -> getString());
return $image;
}
/**
* @return String
* @desc generate the string
*/
function generateString() {
$string = '';
for ($i = 0; $i<$this -> length; $i++) {
$string .= rand(0, 9);
}
$this -> string = $string;
return true;
}
/**
* @return void
* @desc send image header
*/
function sendHeader() {
header('Content-type: image/' . $this -> type);
}
/**
* @return String
* @desc return the string
*/
function getString() {
return $this -> string;
}
}
?>