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captcha.php

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<?php
class zCaptcha extends zCore{
  var $canvas;
  var $baseColor;
  var $store = array();
  var $setup;
  var $fonts;
  var $orgStr;
  var $controller;

  function captcha(&$controller, $len = null){
    $this->controller = $controller;
    $deff = parse_ini_file(ZIGROOT.DRS.Z_DIR_PROJECTS.DRS.Z_PROJECT_DIR.DRS.ZIGSETTINGSDIR.DRS.'captcha.ini.php', true);
    foreach($deff['sys'] as $key => $val){
      if(eregi('^on$', $val))$val = true;
      if(eregi('^off$', $val))$val = false;
      zDef::set($key, $val);
    }
    if($len == null)$len = zDef::get('Z_CAPTCHA_LENGTH');//Using the default Length
    if(zDef::get('Z_CAPTCHA_USE_EXCLUSIVE_FONT'))$this->fonts = array_keys($deff['fonts']);//Gathering the Fonts
    //Prepare the basic canvas
    $this->canvas = imagecreate(zDef::get('Z_CAPTCHA_HEIGHT'), zDef::get('Z_CAPTCHA_WIDTH'));
    $_tmp_col = explode(',',zDef::get('Z_CAPTCHA_BASE_COLOR'));
    $this->baseColor = imagecolorallocate($this->canvas, (int)trim($_tmp_col[0]), (int)trim($_tmp_col[1]), (int)trim($_tmp_col[2]));
    if(eregi('on', zDef::get('Z_CAPTCHA_TRANSPARENT'))){
      $tmp_trans = imagecolorexact($this->canvas, (int)trim($_tmp_col[0]), (int)trim($_tmp_col[1]), (int)trim($_tmp_col[2]));
      imagecolortransparent($this->canvas, $tmp_trans);
    }
    //}
    $this->makeImg($len);
    zSession::start();//Start the session
  }
  function putText(){
    if(count($this->store) > 0){
      $next = max($this->store)+zDef::get('Z_CAPTCHA_TEXT_GAP');
    }else{
      $next = zDef::get('Z_CAPTCHA_TEXT_X_START');
    }
    $rand = rand($this->strSep(zDef::get('Z_CAPTCHA_TEXT_CHAR_RANGE'), 0), $this->strSep(zDef::get('Z_CAPTCHA_TEXT_CHAR_RANGE'), 1));
    if(zDef::get('Z_CAPTCHA_USE_EXCLUSIVE_FONT')){
      $currentFont = ZIGROOT.DRS.Z_DIR_PROJECTS.DRS.Z_PROJECT_DIR.DRS.Z_DIR_FONT.DRS.$this->fonts[rand(0, count($this->fonts)-1)];
      imagefttext($this->canvas,
                    rand($this->strSep(zDef::get('Z_CAPTCHA_TEXT_SIZE_RANGE'), 0), $this->strSep(zDef::get('Z_CAPTCHA_TEXT_SIZE_RANGE'), 1)),
                    rand($this->strSep(zDef::get('Z_CAPTCHA_TEXT_ANGLE_RANGE'), 0), $this->strSep(zDef::get('Z_CAPTCHA_TEXT_ANGLE_RANGE'), 1)),
                    $next,
                    rand($this->strSep(zDef::get('Z_CAPTCHA_TEXT_Y_RANGE'), 0), $this->strSep(zDef::get('Z_CAPTCHA_TEXT_Y_RANGE'), 1)),
                    imagecolorallocate($this->canvas,
                                        rand($this->strSep(zDef::get('Z_CAPTCHA_TEXT_COL_RANGE_RED'), 0), $this->strSep(zDef::get('Z_CAPTCHA_TEXT_COL_RANGE_RED'), 1)),
                                        rand($this->strSep(zDef::get('Z_CAPTCHA_TEXT_COL_RANGE_GRN'), 0), $this->strSep(zDef::get('Z_CAPTCHA_TEXT_COL_RANGE_GRN'), 1)),
                                        rand($this->strSep(zDef::get('Z_CAPTCHA_TEXT_COL_RANGE_BLU'), 0), $this->strSep(zDef::get('Z_CAPTCHA_TEXT_COL_RANGE_BLU'), 1))
                                      ),
                    $currentFont,
                    chr($rand)
                  );
    }else{
      imagechar($this->canvas,
                  zDef::get('Z_CAPTCHA_PLAIN_TEXT_SIZE'),
                  $next,
                  rand($this->strSep(zDef::get('Z_CAPTCHA_TEXT_Y_RANGE'), 0), $this->strSep(zDef::get('Z_CAPTCHA_TEXT_Y_RANGE'), 1)),
                  chr($rand),
                  imagecolorallocate($this->canvas,
                                      rand($this->strSep(zDef::get('Z_CAPTCHA_TEXT_COL_RANGE_RED'), 0), $this->strSep(zDef::get('Z_CAPTCHA_TEXT_COL_RANGE_RED'), 1)),
                                      rand($this->strSep(zDef::get('Z_CAPTCHA_TEXT_COL_RANGE_GRN'), 0), $this->strSep(zDef::get('Z_CAPTCHA_TEXT_COL_RANGE_GRN'), 1)),
                                      rand($this->strSep(zDef::get('Z_CAPTCHA_TEXT_COL_RANGE_BLU'), 0), $this->strSep(zDef::get('Z_CAPTCHA_TEXT_COL_RANGE_BLU'), 1))
                                    )
                );
    }
    $this->store[] = $next;
    $this->orgStr .= chr($rand);
  }
  function makeImg($length){
    for($i=0;$i<=$length-1;$i++){
      $this->putText();
    }
  }
  function output(){
    $this->controller->noAutoViewRender();
    $this->controller->noLayout();
    $this->controller->setContentType('image/png');
    imagepng($this->canvas);
    imagedestroy($this->canvas);
    $_SESSION['gd_str'] = $this->orgStr;
  }
  function strSep($str, $id = -100){
    foreach(explode(',', $str) as $k => $v){
      $ret[$k] = trim($v);
    }
    if($id == -100){
      return $ret;
    }else{
      return $ret[$id];
    }
  }
}
?>

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