php容易驗證碼

php簡單驗證碼

length; $i ++) { //迴圈隨機取字元產生字串$strNum .= $strings [rand ( 0, $count - 1 )];}session_start ();$_SESSION ["verifycode"] = $strNum;$this->im = imagecreate ( $this->width, $this->height );$backgroundcolor = imagecolorallocate ( $this->im, 255, 255, 255 ); //產生背景色$frameColor = imageColorAllocate ( $this->im, 0, 255, 0 );for($i = 0; $i < $this->length; $i ++) {$charY = ($this->height + 9) / 2 + rand ( - 1, 1 ); //定義字元Y座標$charX = $i * 15 + 8; //定義字元X座標//            $text_color = imagecolorallocate($this->im, 255, 0, 0);                                                //產生字元顏色$text_color = imagecolorallocate ( $this->im, mt_rand ( 50, 255 ), mt_rand ( 50, 128 ), mt_rand ( 50, 200 ) );$angle = rand ( - 20, 20 ); //產生字元角度//寫入字元imagettftext ( $this->im, $this->fontSize, $angle, $charX, $charY, $text_color, $this->font, $strNum [$i] );}for($i = 0; $i <= 5; $i ++) { //迴圈畫背景線$linecolor = imagecolorallocate ( $this->im, mt_rand ( 0, 255 ), mt_rand ( 0, 255 ), mt_rand ( 0, 255 ) );$linex = mt_rand ( 1, $this->width - 1 );$liney = mt_rand ( 1, $this->height - 1 );imageline ( $this->im, $linex, $liney, $linex + mt_rand ( 0, 4 ) - 2, $liney + mt_rand ( 0, 4 ) - 2, $linecolor );}for($i = 0; $i <= 32; $i ++) { //迴圈畫背景點,產生麻點效果$pointcolor = imagecolorallocate ( $this->im, mt_rand ( 0, 255 ), mt_rand ( 0, 255 ), mt_rand ( 0, 255 ) );imagesetpixel ( $this->im, mt_rand ( 1, $this->width - 1 ), mt_rand ( 1, $this->height - 1 ), $pointcolor );}imagerectangle ( $this->im, 0, 0, $this->width - 1, $this->height - 1, $frameColor ); //畫邊框ob_clean ();header ( 'Content-type:image/png' );imagepng ( $this->im );imagedestroy ( $this->im );}}$img = new VerifyImg ();$img->Build ();?>

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