Add graphic Verification Code

1. A. php

<? PHP

Session_start ();

Function random ($ Len) { $ Srcstr = "abcdefghijklmnopqrstuvwxyz0123456789 "; Mt_srand (); $ STRs = ""; For ($ I = 0; $ I <$ Len; $ I ++ ){ $ STRs. = $ srcstr [mt_rand (0, 35)]; } Return strtoupper ($ STRs ); } $ STR = random (4); // randomly generated string $ Width = 50; // The image width of the Verification Code $ Height = 25; // height of the Verification Code Image @ Header ("Content-Type: image/PNG "); $ _ Session ["code"] = $ STR; // Echo $ STR; $ Im = imagecreate ($ width, $ height ); // Background color $ Back = imagecolorallocate ($ im, 0xff, 0xff, 0xff ); // Blur the vertex color $ Pix = imagecolorallocate ($ im, 187,230,247 ); // Font color $ Font = imagecolorallocate ($ im, 41,163,238 ); // Plot the vertices of fuzzy match. Mt_srand (); For ($ I = 0; I I <1000; $ I ++) { Imagesetpixel ($ im, mt_rand (0, $ width), mt_rand (0, $ height), $ pix ); } Imagestring ($ im, 5, 7, 5, $ STR, $ font ); Imagerectangle ($ im, 0, 0, $ width-1, $ height-1, $ font ); Imagepng ($ IM ); Imagedestroy ($ IM ); $ _ Session ["code"] = $ STR; ?>

 

 

2. B. php

<? PHP

// Include_once ('identifying. php '); Session_start (); // code for generating the verification code Echo " Echo $ _ session ["code"]; // generate the verification code value ?>

 

Add graphic Verification Code