Code generated by PHP image verification code

First on the index.php page

    function identity () {$this->load->view (' index ', $data);        } function codes () {if ($_post[' code '] = = $_session[' code ')} {echo ' OK ';        }else{echo ' no ';        }} function Create_code () {session_start ();         Generate Verification Code picture Ob_clean ();        Header ("Content-type:image/png");        Full Digital $STR = "1,2,3,4,5,6,7,8,9,0,a,b,c,d,e,f";//To display the characters, you can add or remove $list =explode (",", $str);        $r =count ($list)-1;        $laststr = "";                for ($i =0; $i <4; $i + +) {$randnum =mt_rand (0, $r); $laststr. = $list [$randnum];//Remove the characters and combine them into the string to be displayed} $_session[' code ']= $laststr;        Put the string into the session//echo $laststr;  $img =imagecreate (28,28);//Generate Picture $black =imagecolorallocate ($img, 0,0,0);        Set color $white =imagecolorallocate ($img, 255,255,255);        $gray =imagecolorallocate ($img, 200,200,200);        $red =imagecolorallocate ($img, 255,0,0); $cl = IMAgefill ($img, 0,0, $red);//fill the picture with the color//put the validation method into the picture imagestring ($img, 4,10,8, $laststr, $black);//place validation on the image for ($i =0; $i <8; $i + +) {$lineColor = Imagecolorallocate ($img, Rand (0,255), Rand (0,255), Rand (0,255                ));        Imageline ($img, rand (0, $x), 0,rand (0, $x), $y, $lineColor);        }//Interference point for ($i =0; $i <250; $i + +) {Imagesetpixel ($img, rand (0, $x), rand (0, $y), $fontColor);        } $AA = Imagepng ($img);              $BB = Imagedestroy ($img);    Echo $aa; }

On the View page index.php

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