PHP实验图片验证码

来源：互联网发布：苹果电脑影视制作软件编辑：程序博客网时间：2024/06/11 18:57
话不多说，直接上代码：
<?phpclass ValidateCode{ private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//随机因子private $code;//验证码 private $codelen = 4;//验证码长度 private $width = 130;//宽度 private $height = 50;//高度 private $img;//图形资源句柄 private $font;//指定的字体 private $fontsize = 20;//指定字体大小 private $fontcolor;//指定字体颜色 //构造方法初始化 public function __construct() {  $this->font = dirname(__FILE__).'/font/elephant.ttf';//注意字体路径要写对，否则显示不了图片 } //生成随机码 private function createCode() {  $_len = strlen($this->charset)-1;  for ($i=0;$i<$this->codelen;$i++){   $this->code .= $this->charset[mt_rand(0,$_len)];  } } //生成背景 private function createBg(){  $this->img = imagecreatetruecolor($this->width, $this->height);  $color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));  imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color); } //生成文字 private function createFont() {  $_x = $this->width / $this->codelen;  for ($i=0;$i<$this->codelen;$i++){   $this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));   imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,$this->code[$i]);  } } //生成线条、雪花 private function createLine() {  //线条  for ($i=0;$i<6;$i++) {   $color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));  imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color);  }  //雪花  for ($i=0;$i<100;$i++){   $color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));   imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);  } } //输出 private function outPut() {  header('Content-type:image/png');  imagepng($this->img);  imagedestroy($this->img); } //对外生成 public function doimg()  {  $this->createBg();  $this->createCode();  $this->createLine();  $this->createFont();  $this->outPut(); } //获取验证码 public function getCode() {  return strtolower($this->code); }}?>
原文链接：http://www.jb51.net/article/40341.htm
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