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<?php
//Éú³ÉÑéÖ¤ÂëͼƬ
Header("Content-type: image/PNG");
srand((double)microtime()*1000000);//²¥ÏÂÒ»¸öÉú³ÉËæ»úÊý×ÖµÄÖÖ×Ó£¬ÒÔ·½±ãÏÂÃæËæ»úÊýÉú³ÉµÄʹÓÃ
session_start();//½«Ëæ»úÊý´æÈësessionÖÐ
$_SESSION['authnum']="";
$im = imagecreate(62,20); //ÖÆ¶¨Í¼Æ¬±³¾°´óС
$black = ImageColorAllocate($im, 0,0,0); //É趨ÈýÖÖÑÕÉ«
$white = ImageColorAllocate($im, 255,255,255);
$gray = ImageColorAllocate($im, 200,200,200);
imagefill($im,0,0,$gray); //²ÉÓÃÇøÓòÌî³ä·¨£¬É趨£¨0,0£©
while(($authnum=rand()%100000)<10000);
//½«ËÄλÕûÊýÑéÖ¤Âë»æÈëͼƬ
$_SESSION['authnum']=$authnum;
imagestring($im, 5, 10, 3, $authnum, $black);
// Óà col ÑÕÉ«½«×Ö·û´® s »­µ½ image Ëù´ú±íµÄͼÏñµÄ x£¬y ×ù±ê´¦£¨Í¼ÏñµÄ×óÉϽÇΪ 0, 0£©¡£
//Èç¹û font ÊÇ 1£¬2£¬3£¬4 »ò 5£¬ÔòʹÓÃÄÚÖÃ×ÖÌå
for($i=0;$i<200;$i++) //¼ÓÈë¸ÉÈÅÏóËØ
{
$randcolor = ImageColorallocate($im,rand(0,255),rand(0,255),rand(0,255));
imagesetpixel($im, rand()%70 , rand()%30 , $randcolor);
}
ImagePNG($im);
ImageDestroy($im);
?>
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