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一个简单的php图形验证码生成程序 - <?php
- /**
- *
- * @file imgvcode.php
- * @create date 2007-09-25
- * @copyright (c) 2005 - 2007 eifr.com
- * @license http://www.hzhuti.com/nokia/n97/
- * eifr is free software
- */
- session_start();
- // main
- $vcodes = '';
- //generate Number 4
- srand((double)microtime()*1000000);
- for($i=0;$i<4;$i++){
- $vcodes.=rand(1,9);
- }
- $_SESSION['eifr_checkvcode'] = $vcodes;
- if(function_exists('imagecreate')){
- //generate picture validation code
- Header("Content-type: image/PNG");
- $img = imagecreate(44,18);
- $bg = ImageColorAllocate($img, 245,245,245);
- imagefill($img,0,0,$bg); //background
-
- //generate Number 4
- for($i=0;$i<4;$i++){
- $font = ImageColorAllocate($img, rand(100,255),rand(0,100),rand(100,255));
- $vnum = substr($vcodes, $i, 1);
- imagestring($img, 5, 2+$i*10, 1, $vnum, $font);
- }
- //add interference
- for($i=0;$i<100;$i++)
- {
- $randcolor = ImageColorallocate($img,rand(0,255),rand(0,255),rand(0,255));
- imagesetpixel($img, rand()%70 , rand()%30 , $randcolor);
- }
- ImagePNG($img);
- ImageDestroy($img);
- }
- ?>
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