//驗證碼類 class ValidateCode {private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//隨機因子private $code;//驗證碼private $codelen = 4;//驗證碼長度private $width = 130;//寬度private $height = 50;//高度private $img;//圖形資源句柄private $font;//指定的字體private $fontsize = 20;//指定字體大小private $fontcolor;//指定字體顏色//構造方法初始化public function __construct() {$this->font = dirname(__FILE__).'/font/elephant.ttf';//注意字體路徑要寫對，否則顯示不了圖片}//生成隨機碼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]);}}//生成線條、雪花private function createLine() {//線條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);}}//輸出private function outPut() {header('Content-type:image/png');imagepng($this->img);imagedestroy($this->img);}//對外生成public function doimg() {$this->createBg();$this->createCode();$this->createLine();$this->createFont();$this->outPut();}//獲取驗證碼public function getCode() {return strtolower($this->code);} }

　　

轉載于:https://www.cnblogs.com/yang95/articles/4757577.html

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