php編寫產生酷炫驗證碼，php酷炫驗證碼_PHP教程

php編寫產生酷炫驗證碼，php酷炫驗證碼

 1 php 2 $im=imagecreate(200,100);//產生畫布 3 imagecolorallocate($im,0,0,0);//背景色 4 $white=imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));//產生隨機顏色 5 for($i=0;$i<9;$i++) 6 { 7     imageline($im,rand(0,200),rand(0,100),rand(0,200),rand(0,100),$white);//產生幹擾線條元素 8 } 9 for($i=0;$i<150;$i++)10 {11     imagesetpixel($im,rand(0,200),rand(0,100),$white);//產生幹擾點元素12 }13 for($i=0,$str='';$i<4;$i++)//通過迴圈獲得四個字元14 {15     switch(rand(1,3))16     {17         case'1':18         $ch=rand(0,9);19         break; 20         case'2':21         $ch=sprintf('%c',rand(97,122));22         break;23         case'3':24         $ch=sprintf('%c',rand(65,90));25         break;26     }27         $str.=$ch;28 29 }30 imagettftext($im,32,rand(0,15),55,70,$white,'c.ttc',$str);//在畫布上輸出字串31 header("Content-type:image/jpeg");32 imagejpeg($im);33 imagedestroy($im);34 ?>

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