- session_start();
- $type = 'gif';
- $width= 56;
- $height= 22;
- header("Content-type: image/".$type);
- srand((double)microtime()*1000000);
- $randval = randStr(4,"NUMBER");
- if($type!='gif' && function_exists('imagecreatetruecolor')){
- $im = @imagecreatetruecolor($width,$height);
- }else{
- $im = @imagecreate($width,$height);
- }
- $r = Array(225,211,255,223);
- $g = Array(225,236,237,215);
- $b = Array(225,236,166,125);
-
- $key = rand(0,3);
-
- $backColor = ImageColorAllocate($im,$r[$key],$g[$key],$b[$key]);//背景色（随机）
- $borderColor = ImageColorAllocate($im, 0, 0, 0);//边框色
- $pointColor = ImageColorAllocate($im, 255, 170, 255);//点颜色
-
- @imagefilledrectangle($im, 0, 0, $width - 1, $height - 1, $backColor);//背景位置
- @imagerectangle($im, 0, 0, $width-1, $height-1, $borderColor); //边框位置
- $stringColor = ImageColorAllocate($im, 255,51,153);
-
- for($i=0;$i<=100;$i++){
- $pointX = rand(2,$width-2);
- $pointY = rand(2,$height-2);
- @imagesetpixel($im, $pointX, $pointY, $pointColor);
- }
-
- @imagestring($im, 16, 10, 2, $randval, $stringColor);
- $ImageFun='Image'.$type;
- $ImageFun($im);
- @ImageDestroy($im);
- $_SESSION['validatecode'] = $randval;
- //产生随机字符串
- function randStr($len=6,$format='ALL') {
- switch($format) {
- case 'ALL':
- $chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'; break;
- case 'CHAR':
- $chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'; break;
- case 'NUMBER':
- $chars='0123456789'; break;
- default :
- $chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
- break;
- }
- $string="";
- while(strlen($string)<$len)
- $string.=substr($chars,(mt_rand()%strlen($chars)),1);
- return $string;
- }
- ?>
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