PHP图片验证码类

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<?phpclass Imagecode{private $width,$height,$str;//宽、高、随机字符function __construct($width=120,$height=30,$str="ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"){$this->width=$width;$this->height=$height;$this->str=$str;}function creatimg(){return imagecreate($this->width,$this->height);}function random($len=4)  //随机数{$str = substr(str_shuffle($this->str),0,$len);//取4个字符$this->strout=$str;}function setbackground($img){$background_color=imagecolorallocate($img,255,255, 255);$border_color=imagecolorallocate($img, 41,163,238);$color = ImageColorAllocate($img, 0,0,0);imagefill($img,0, 0, $background_color);//背景、白色imagerectangle($img, 0, 0, $this->width-1, $this->height-1, $border_color);//边框$w=$this->width/2-18;$h=$this->height/2-7;imagestring($img,12,$w,$h,$this->strout, $border_color);//字位置for($i=1;$i<3;$i++){//$line_color = imagecolorallocate($img,rand(0,255),rand(0,255),rand(0,255));//随机颜色//imageline($img,1,$i,47,$i,$line_color);//固定 位置画线//imagesetpixel($img,mt_rand(0, $width) ,mt_rand(0,$height), $line_color); //画点imageline($img,rand($w,30),rand($h,21),rand($w+20,50),rand($h,21),$border_color); //随机位置画线}}function imgout(){$img=$this->creatimg();$this->random();$this->setbackground($img);imagepng($img);imagedestroy($img);$_SESSION["code"] = $this->strout ;session_destroy();}}@header("Content-Type:image/png");session_start();$img=new Imagecode(50,20);$img->imgout();?>
PHP图片验证码
效果：
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