www.gusucode.com > iWebshop开源PHP商城系统 v2.8源码程序 > iwebshop/lib/core/util/captcha_class.php
<?php
/**
* @class Captcha
* @brief 验证码生成类库
*/
class Captcha
{
/** Width of the image */
public $width = 200;
/** Height of the image */
public $height = 70;
/**
* Path for resource files (fonts, words, etc.)
* "resources" by default. For security reasons, is better move this
* directory to another location outise the web server
*/
/** Min word length (for non-dictionary random text generation) */
public $minWordLength = 4;
/**
* Max word length (for non-dictionary random text generation)
* Used for dictionary words indicating the word-length
* for font-size modification purposes
*/
public $maxWordLength = 5;
/** Sessionname to store the original text */
public $session_var = 'captcha';
/** Background color in RGB-array */
public $backgroundColor = array(255, 255, 255);
/** Foreground colors in RGB-array */
public $colors = array(
array(27,78,181), // blue
array(22,163,35), // green
array(214,36,7), // red
);
/** Shadow color in RGB-array or null */
public $shadowColor = null; //array(0, 0, 0);
public $fontSize = 25;
/**
* Font configuration
* - font: TTF file
* - spacing: relative pixel space between character
* - minSize: min font size
* - maxSize: max font size
*/
public $fonts = array(
'Time' => array('spacing' => 2, 'minSize' => 22, 'maxSize' => 24, 'font' => 'font.ttf'),
);
/** Wave configuracion in X and Y axes */
public $Yperiod = 12;
public $Yamplitude = 14;
public $Xperiod = 11;
public $Xamplitude = 5;
/** letter rotation clockwise */
public $maxRotation = 8;
/**
* Internal image size factor (for better image quality)
* 1: low, 2: medium, 3: high
*/
public $scale = 3;
/**
* Blur effect for better image quality (but slower image processing).
* Better image results with scale=3
*/
public $blur = false;
/** Debug? */
public $debug = false;
/** Image format: jpeg or png */
public $imageFormat = 'jpeg';
/** GD image */
public $im;
public function __construct($config = array()) {
}
public function CreateImage(&$text='') {
$ini = microtime(true);
/** Initialization */
$this->ImageAllocate();
/** Text insertion */
$text = $this->GetCaptchaText();
$fontcfg = $this->fonts[array_rand($this->fonts)];
$this->WriteText($text, $fontcfg);
/** Transformations */
$this->WaveImage();
if ($this->blur && function_exists('imagefilter'))
{
imagefilter($this->im, IMG_FILTER_GAUSSIAN_BLUR);
}
$this->ReduceImage();
if ($this->debug)
{
imagestring($this->im, 1, 1, $this->height-8,
"$text {$fontcfg['font']} ".round((microtime(true)-$ini)*1000)."ms",
$this->GdFgColor
);
}
/** Output */
$this->WriteImage();
$this->Cleanup();
}
/**
* Creates the image resources
*/
protected function ImageAllocate()
{
// Cleanup
if (!empty($this->im))
{
imagedestroy($this->im);
}
$this->im = imagecreatetruecolor($this->width*$this->scale, $this->height*$this->scale);
// Background color
$this->GdBgColor = imagecolorallocate($this->im,
$this->backgroundColor[0],
$this->backgroundColor[1],
$this->backgroundColor[2]
);
imagefilledrectangle($this->im, 0, 0, $this->width*$this->scale, $this->height*$this->scale, $this->GdBgColor);
// Foreground color
$color = $this->colors[mt_rand(0, sizeof($this->colors)-1)];
$this->GdFgColor = imagecolorallocate($this->im, $color[0], $color[1], $color[2]);
// Shadow color
if (!empty($this->shadowColor) && is_array($this->shadowColor) && sizeof($this->shadowColor) >= 3)
{
$this->GdShadowColor = imagecolorallocate($this->im,
$this->shadowColor[0],
$this->shadowColor[1],
$this->shadowColor[2]
);
}
}
/**
* Text generation
*
* @return string Text
*/
protected function GetCaptchaText()
{
$text = $this->GetRandomCaptchaText();
return $text;
}
/**
* Random text generation
* @return string Text
*/
protected function GetRandomCaptchaText($length = null)
{
if (empty($length))
{
$length = rand($this->minWordLength, $this->maxWordLength);
}
$words = "abcdefghijlmnopqrstvwyz";
$vocals = "aeiou";
$text = "";
$vocal = rand(0, 1);
for ($i=0; $i<$length; $i++)
{
if ($vocal)
{
$text .= substr($vocals, mt_rand(0, 4), 1);
}
else
{
$text .= substr($words, mt_rand(0, 22), 1);
}
$vocal = !$vocal;
}
return $text;
}
/**
* Text insertion
*/
protected function WriteText($text, $fontcfg = array())
{
if (empty($fontcfg))
{
// Select the font configuration
$fontcfg = $this->fonts[array_rand($this->fonts)];
}
// Full path of font file
$fontfile = dirname(__FILE__).DIRECTORY_SEPARATOR.$fontcfg['font'];
/** Increase font-size for shortest words: 9% for each glyp missing */
$lettersMissing = $this->maxWordLength-strlen($text);
$fontSizefactor = 1+($lettersMissing*0.09);
//$fontspace = $this->width/strlen($text)-2;
//$minSize = $fontspace;
//$maxSize= $fontspace;
// Text generation (char by char)
$x = 20*$this->scale;
$y = round(($this->height*27/40)*$this->scale);
$length = strlen($text);
for ($i=0; $i<$length; $i++)
{
$degree = rand($this->maxRotation*-1, $this->maxRotation);
$fontsize = rand($this->fontSize+1, $this->fontSize-1)*$this->scale*$fontSizefactor;
//$fontsize = $maxSize*$this->scale*$fontSizefactor;
$letter = substr($text, $i, 1);
if ($this->shadowColor)
{
$coords = imagettftext($this->im, $fontsize, $degree,
$x+$this->scale, $y+$this->scale,
$this->GdShadowColor, $fontfile, $letter);
}
$coords = imagettftext($this->im, $fontsize, $degree,
$x, $y,
$this->GdFgColor, $fontfile, $letter);
$x += ($coords[2]-$x) + ($fontcfg['spacing']*$this->scale);
}
}
/**
* Wave filter
*/
protected function WaveImage()
{
// X-axis wave generation
$xp = $this->scale*$this->Xperiod*rand(1,3);
$k = rand(0, 100);
for ($i = 0; $i < ($this->width*$this->scale); $i++)
{
imagecopy($this->im, $this->im,
$i-1, sin($k+$i/$xp) * ($this->scale*$this->Xamplitude),
$i, 0, 1, $this->height*$this->scale);
}
// Y-axis wave generation
$k = rand(0, 100);
$yp = $this->scale*$this->Yperiod*rand(1,2);
for ($i = 0; $i < ($this->height*$this->scale); $i++)
{
imagecopy($this->im, $this->im,
sin($k+$i/$yp) * ($this->scale*$this->Yamplitude), $i-1,
0, $i, $this->width*$this->scale, 1);
}
}
/**
* Reduce the image to the final size
*/
protected function ReduceImage()
{
$imResampled = imagecreatetruecolor($this->width, $this->height);
imagecopyresampled($imResampled, $this->im,
0, 0, 0, 0,
$this->width, $this->height,
$this->width*$this->scale, $this->height*$this->scale
);
imagedestroy($this->im);
$this->im = $imResampled;
}
/**
* File generation
*/
protected function WriteImage()
{
if ($this->imageFormat == 'png' && function_exists('imagepng'))
{
header("Content-type: image/png");
imagepng($this->im);
}
else
{
header("Content-type: image/jpeg");
imagejpeg($this->im, null, 90);
}
}
/**
* Cleanup
*/
protected function Cleanup()
{
imagedestroy($this->im);
}
}
?>