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ÑéÖ¤ÂëµÄͼƬ¡£
<img  src="imgAuth.php" id="authnumimg" title="¿´²»Ç壿µã»÷»»ÕÅͼƬ£¡" onclick="this.src='imgAuth.php?a='+Math.random()"/>
Éú³ÉÑéÖ¤Âë²¢±£´æÔÚsessionÖеÄPHP,index.php
  session_start();
  $a=$_SESSION["VCODE"];
  if($a==$_POST["authnum"]){
      echo "ÑéÖ¤ÂëÏàͬ";
  }else{
      echo "ÑéÖ¤Â벻ͬ";
  }
ͼƬÑéÖ¤Âë³ÌÐò:
class imgAuth{
  session_start();
//Éú³ÉÑéÖ¤ÂëͼƬ
  Header("Content-type: image/PNG");
  $im = imagecreate(44,18);
  $back = ImageColorAllocate($im, 245,245,245);
  imagefill($im,0,0,$back); //±³¾°

  srand((double)microtime()*1000000);
//Éú³É4λÊý×Ö
  for($i=0;$i <4;$i++){
    $font = ImageColorAllocate($im, rand(100,255),rand(0,100),rand(100,255));
    $authnum=rand(1,9);
    $vcodes.=$authnum;
    imagestring($im, 5, 2+$i*10, 1, $authnum, $font);
  }

  for($i=0;$i <100;$i++) //¼ÓÈë¸ÉÈÅÏóËØ
  {
    $randcolor = ImageColorallocate($im,rand(0,255),rand(0,255),rand(0,255));
    imagesetpixel($im, rand()%70 , rand()%30 , $randcolor);


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