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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | <?php //验证码的制作 //1.生成4位的随机数 for ( $i =0; $i <4; $i ++){ $rand .= dechex (rand(1, 15)); } //2.创建图片 //创建一张图片 $image =imagecreatetruecolor(100, 30); //背景颜色 $bg =imagecolorallocate( $image , 0, 0, 0); $te =imagecolorallocate( $image , 255,255,255); //划线 for ( $i =0; $i <4; $i ++){ $lineColor =imagecolorallocate( $image , rand(20, 225), rand(20, 225), rand(20, 225)); imageline( $image , rand(0, 100), 0, 100,30, $lineColor ); } //划点 for ( $i =0; $i <200; $i ++){ imagesetpixel( $image , rand()%100, rand()%100, $lineColor ); } //添加文字 //编码转换 $str =iconv( "GBK" , "UTF-8" , "广州GZ" ); imagettftext( $image , 12,11, 20, 20, $lineColor , 'simhei.ttf' , $str ); //3.随机数写入图片$font=(1~6) imagestring( $image , rand(3, 6), rand(3, 70), rand(0, 16), $rand , $te ); //4.随机数保存在session中 //启动session session_start(); //把验证码放入session $_SESSION [vilidationCode]= $rand ; header( "Content-type: image/jpeg" ); imagejpeg( $image ); ?> |