一個好用的驗證碼PHP工具類

 
<?php
/**


驗證碼類
*/
class Base_Tool_Verify{
 /**

生成驗證碼方法
*/
public static  function createCode(){
 //生成驗證碼圖片
 // 全數字
 $str = "D,B,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,W,J,K,M,M,N,K,P,Q,R,S,T,U,V,W,X,Y,Z";      //要顯示的字符，可自己進行增刪
 $list = explode(",", $str);
 $cmax = count($list) - 1;
 $verifyCode = '';
 for ( $i=0; $i < 4; $i++ ){

 $randnum = mt_rand(0, $cmax);
 $verifyCode .= $list[$randnum];           //取出字符，組合成為我們要的驗證碼字符

}
 $_SESSION['code'] = $verifyCode;        //將字符放入SESSION中
$im = imagecreate(80,28);    //生成圖片
 $black = imagecolorallocate($im, 0 ,0 ,0);     //此條及以下三條為設置的顏色
 $white = imagecolorallocate($im, 244,249,244);
 $gray = imagecolorallocate($im, rand(200,255),rand(200,255),rand(200,255));
 $red = imagecolorallocate($im, rand(200,255), rand(200,255), rand(200,255));
 $rand_color = imagecolorallocate($im, rand(0,255), rand(0,255), rand(0,255));
 $rand_color2 = imagecolorallocate($im, rand(0,255), rand(0,255), rand(0,255));
 imagefill($im,0,0,$white);     //給圖片填充顏色
 $pix=imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));
 mt_srand();
 for($i=0;$i<100;$i++)
 {
 imagesetpixel($im,mt_rand(0,180),mt_rand(0,35),$pix);

 }
 imageline($im, 0,rand(0,28), 80, rand(0,28), $rand_color);

 imageline($im, 0,rand(0,28), 80, rand(0,28), $rand_color2);
//將驗證碼繪入圖片
 $mycolor = imagecolorallocate($im, 0, 78, 152);
 $path = API_PATH.DS.'Base'.DS.'Tool';
 putenv('GDFONTPATH=' . $path);
 $font = 'simhei.ttf';
 $arrstr = str_split($verifyCode);
 imagettftext($im, 20, rand(0,50), 10, rand(20,30), $mycolor, $font, $arrstr[0]);
 imagettftext($im, 15, rand(0,50), 20, rand(20,30), $mycolor, $font, $arrstr[1]);
 imagettftext($im, 15, rand(0,50), 30, rand(20,30), $mycolor, $font, $arrstr[2]);
 imagettftext($im, 15, rand(0,50), 40, rand(20,30), $mycolor, $font, $arrstr[3]);
 $font2=imagecolorallocate($im,41,163,238);
 imagerectangle($im,0,0,1,1,$font2);
 imagepng($im);
 imagedestroy($im);
}
}
</pre>