在lib目录添加一个类sfCaptcha.class.php
复制内容到剪贴板
代码:
class sfCaptcha
{
public $securityCode;
private $codeLength=6;
private $imageFile= 'captchaImg.jpg';
public $fontSize = 12;
public $fontColor = array("252525","8b8787","550707");
public function simpleRandString($length, $list="23456789ABDEFGHJKLMNQRTYabdefghijkmnqrty") {
/*
* Generates a random string with the specified length
* Chars are chosen from the provided [optional] list
*/
mt_srand((double)microtime()*1000000);
$newstring = "";
if ($length > 0) {
while (strlen($newstring) < $length) {
$newstring .= $list[mt_rand(0, strlen($list)-1)];
}
}
return $newstring;
}
public function generateImage()
{
$this->securityCode = $this->simpleRandString($this->codeLength);
$img_path = dirname(__FILE__)."/../web/uploads/";
if(!is_writable($img_path) && !is_dir($img_path)){
$error = "The image path $img_path does not appear to be writable or the folder does not exist. Please verify your settings";
throw new Exception($error);
}
$this->img = ImageCreateFromJpeg($img_path.$this->imageFile);
$img_size = getimagesize($img_path.$this->imageFile);
foreach($this->fontColor as $fcolor)
{
$color[] = imagecolorallocate($this->img,
hexdec(substr($fcolor, 1, 2)),
hexdec(substr($fcolor, 3, 2)),
hexdec(substr($fcolor, 5, 2))
);
}
$line = imagecolorallocate($this->img,255,255,255);
$line2 = imagecolorallocate($this->img,200,200,200);
$fw = imagefontwidth($this->fontSize)+3;
$fh = imagefontheight($this->fontSize);
// create a new string with a blank space between each letter so it looks better
$newstr = "";
for ($i = 0; $i < strlen($this->securityCode); $i++) {
$newstr .= $this->securityCode[$i] ." ";
}
// remove the trailing blank
$newstr = trim($newstr);
// center the string
$x = ($img_size[0] - strlen($newstr) * $fw ) / 2;
$font[0] = 'arial.ttf';
$font[1] = 'TIMES.ttf';
$font[2] = 'COURI.ttf';
// create random lines over text
for($i=0; $i <3;$i++){
$s_x = rand(40,180);
$s_y = rand(5,35);
$e_x = rand(($s_x-50), ($s_x+50));
$e_y = rand(5,35);
$c = rand(0, (count($color)-1));
imageline($this->img, $s_x,$s_y, $e_x,$e_y, $color[$c]);
}
// random bg ellipses
imageellipse($this->img, $s_x, $s_y, $e_x, $e_y, $line);
imageellipse($this->img, $e_x, $e_y, $s_x, $s_y, $line2);
// output each character at a random height and standard horizontal spacing
for ($i = 0; $i < strlen($newstr); $i++) {
$hz = mt_rand( 10, $img_size[1] - $fh - 5);
// randomize rotation
$rotate = rand(-35, 35);
// randomize font size
$this->fontSize = rand(14, 18);
// radomize color
$c = rand(0, (count($color)-1));
// imagechar( $this->img, $this->fontSize, $x + ($fw*$i), $hz, $newstr[$i], $color);
imagettftext($this->img, $this->fontSize,$rotate , $x + ($fw*$i), $hz + 12, $color[0], $font[$c], $newstr[$i]);
}
}
} 验证方法：
复制内容到剪贴板
代码:
// replace XXX with the name of the action that is calling the form, like validateRegistration if your action is executeRegistration.
// This function validates the stored captcha against the users input and returns true if they match, or returns an error back to the form if they don't.
public function validateXXX()
{
if($this->getRequest()->getMethod() == sfRequest::POST)
{
$captcha = $this->getRequestParameter('captcha');
$session_captcha = $this->getUser()->getAttribute('captcha');
if($captcha != $session_captcha)
{
$this->getRequest()->setError('captcha', 'The code you entered did not match the one provided, please try again.');
return false;
}
}
return true;
}
// action that executes the actual image
public function executeGetImage()
{
$this->getResponse()->setContentType('image/jpeg');
$captcha = new sfCaptcha();
$captcha->generateImage();
$this->getUser()->setAttribute('captcha', $captcha->securityCode);
imagejpeg($captcha->img);
imageDestroy($captcha->img);
} 在模版中调用显示：
复制内容到剪贴板
代码:
<div class='error'><?php echo form_error('captcha') ?></div>
<img src='<?php echo url_for('user/getimage'); ?>'><br>
<?php echo input_tag('captcha') ?>需要一个在/web/uploads/目录里放一个200×40的jpg文件”captchaImg.jpg”,这个
文件可以换成自己的背景图，这样这个验证码效果就很酷。
