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safeCode.php文件中的代码如下所示：

<?
if(isset($_REQUEST["rand"]) && !emptyempty($_REQUEST["rand"])){
  $randStr = $_REQUEST["rand"];
}else {
  $randStr = "1234";
}
$type = 'gif';
$width= 40;
$height= 18;
header("Content-type: image/".$type);
srand((double)microtime()*1000000);
$randval = $randStr;
if($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, 3, 5, 1, $randval, $stringColor);
$ImageFun='Image'.$type;
$ImageFun($im);
@ImageDestroy($im);
?>

<? if(isset($_REQUEST["rand"]) && !empty($_REQUEST["rand"])){   $randStr = $_REQUEST["rand"]; }else {   $randStr = "1234"; } $type = 'gif'; $width= 40; $height= 18; header("Content-type: image/".$type); srand((double)microtime()*1000000); $randval = $randStr; if($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, 3, 5, 1, $randval, $stringColor); $ImageFun='Image'.$type; $ImageFun($im); @ImageDestroy($im); ?>

function.php中产生随机字符的代码如下所示：

<?
//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;
}
?>

<? //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; } ?>

如何使用：
在需要用到验证码的地方加下面的代码，你就会看到生成的验证码图片了

<img src="safeCode.php?rand=123456">