确实不错啊，呵呵，
不过我好像在YII框架中也有看到过这个。
补充：
默认的应该是把resource放在和.htaccess以及和最前面的index.php一个目录。
大哥，图片显示不出来。
太给力了！！
<?phpif ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* SimpleCaptcha class
*
*/
class Simple_captcha {
/** Width of the image */
public $width= 200;
/** Height of the image */
public $height = 70;
/** Dictionary word file (empty for randnom text) */
public $wordsFile = 'words/en.php';
/**
* 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
*
*/
public $resourcesPath = '';
/** Min word length (for non-dictionary random text generation) */
public $minWordLength = 5;
/**
* Max word length (for non-dictionary random text generation)
*
* Used for dictionary words indicating the word-length
* for font-size modification purposes
*/
public $maxWordLength = 8;
/** 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);
/**
* Font configuration
*
* - font: TTF file
* - spacing: relative pixel space between character
* - minSize: min font size
* - maxSize: max font size
*/
public $fonts = array(
'Antykwa'=> array('spacing' => -3, 'minSize' => 27, 'maxSize' => 30, 'font' => 'AntykwaBold.ttf'),
'Candice'=> array('spacing' =>-1.5,'minSize' => 28, 'maxSize' => 31, 'font' => 'Candice.ttf'),
'DingDong' => array('spacing' => -2, 'minSize' => 24, 'maxSize' => 30, 'font' => 'Ding-DongDaddyO.ttf'),
'Duality'=> array('spacing' => -2, 'minSize' => 30, 'maxSize' => 38, 'font' => 'Duality.ttf'),
'Heineken' => array('spacing' => -2, 'minSize' => 24, 'maxSize' => 34, 'font' => 'Heineken.ttf'),
'Jura' => array('spacing' => -2, 'minSize' => 28, 'maxSize' => 32, 'font' => 'Jura.ttf'),
'StayPuft' => array('spacing' =>-1.5,'minSize' => 28, 'maxSize' => 32, 'font' => 'StayPuft.ttf'),
'Times' => array('spacing' => -2, 'minSize' => 28, 'maxSize' => 34, 'font' => 'TimesNewRomanBold.ttf'),
'VeraSans' => array('spacing' => -1, 'minSize' => 20, 'maxSize' => 28, 'font' => 'VeraSansBold.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 = 2;
/**
* 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 $text = 'tongyn';
public function __construct($config = array()) {
$this -> initialize($config);
}
public function initialize($config = array()){
foreach ($config as $key => $val){
if (isset($this->$key)){
$this->$key = $val;
}
}
}
function just_test(){
if (empty($fontcfg)) {
// Select the font configuration
$fontcfg= $this->fonts;
}
// Full path of font file
$fontfile = $this->resourcesPath.'/fonts/'.$fontcfg['font'];
echo $fontfile;
}
public function CreateImage() {
$ini = microtime(true);
/** Initialization */
$this->ImageAllocate();
/** Text insertion */
//$text = $this->GetCaptchaText();
$text = $this->text;
//$text = 'tongyn';
$fontcfg= $this->fonts;
$this->WriteText($text, $fontcfg);
//$_SESSION[$this->session_var] = $text;
/** 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,
$this->backgroundColor,
$this->backgroundColor
);
imagefilledrectangle($this->im, 0, 0, $this->width*$this->scale, $this->height*$this->scale, $this->GdBgColor);
// Foreground color 0-2
$color = $this->colors;
$this->GdFgColor = imagecolorallocate($this->im, $color, $color, $color);
// Shadow color
if (!empty($this->shadowColor) && is_array($this->shadowColor) && sizeof($this->shadowColor) >= 3) {
$this->GdShadowColor = imagecolorallocate($this->im,
$this->shadowColor,
$this->shadowColor,
$this->shadowColor
);
}
}
/**
* Text generation
*
* @return string Text
*/
protected function GetCaptchaText() {
$text = $this->GetDictionaryCaptchaText();
if (!$text) {
$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;
}
/**
* Random dictionary word generation
*
* @param boolean $extended Add extended "fake" words
* @return string Word
*/
function GetDictionaryCaptchaText($extended = false) {
if (empty($this->wordsFile)) {
return false;
}
// Full path of words file
if (substr($this->wordsFile, 0, 1) == '/') {
$wordsfile = $this->wordsFile;
} else {
$wordsfile = $this->resourcesPath.'/'.$this->wordsFile;
}
$fp = fopen($wordsfile, "r");
$length = strlen(fgets($fp));
if (!$length) {
return false;
}
$line = rand(1, (filesize($wordsfile)/$length)-2);
if (fseek($fp, $length*$line) == -1) {
return false;
}
$text = trim(fgets($fp));
fclose($fp);
/** Change ramdom volcals */
if ($extended) {
$text = preg_split('//', $text, -1, PREG_SPLIT_NO_EMPTY);
$vocals = array('a', 'e', 'i', 'o', 'u');
foreach ($text as $i => $char) {
if (mt_rand(0, 1) && in_array($char, $vocals)) {
$text[$i] = $vocals;
}
}
$text = implode('', $text);
}
return $text;
}
/**
* Text insertion
*/
protected function WriteText($text, $fontcfg = array()) {
if (empty($fontcfg)) {
// Select the font configuration
$fontcfg= $this->fonts;
}
// Full path of font file
$fontfile = $this->resourcesPath.DIRECTORY_SEPARATOR.'fonts'.DIRECTORY_SEPARATOR.$fontcfg['font'];
/** Increase font-size for shortest words: 9% for each glyp missing */
$lettersMissing = $this->maxWordLength-strlen($text);
$fontSizefactor = 1+($lettersMissing*0.09);
// 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);
$fontsize = rand($fontcfg['minSize'], $fontcfg['maxSize'])*$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-$x) + ($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() {
// Reduzco el tama駉 de la imagen
$imResampled = imagecreatetruecolor($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, 80);
}
}
/**
* Cleanup
*/
protected function Cleanup() {
imagedestroy($this->im);
}
}
// END CI_Config class
/* End of file SimpleCaptcha.php */
{:1_1:}不错不错
:lol我找了很久的。。
帅死了。
为什么 我显示出来背景颜色 ，却没数字呀。。
:'(没显示出来