A simple php Verification Code Program-PHP source code

This article introduces the code generated by the Verification Code Program in php, the method of calling, and whether the verification code program entered by the user is correct. This article introduces the code generated by the Verification Code Program in php, the method of calling, and whether the verification code program entered by the user is correct.

Script ec (2); script

Create_code.php code

The Code is as follows:

Session_start (); // Generate a verification code Image Header ("Content-type: image/png "); // All numbers $ Str = "1, 2, 3, 4, 5, 6, 7, 8, 9, a, B, c, d, f, g"; // you can add or delete the characters to be displayed. $ List = explode (",", $ str ); $ Cmax = count ($ list)-1; $ VerifyCode = ''; For ($ I = 0; $ I <5; $ I ++ ){ $ Randnum = mt_rand (0, $ cmax ); $ VerifyCode. = $ list [$ randnum]; // extract the characters and combine them into the verification code characters. } $ _ SESSION ['code'] = $ verifyCode; // put the characters in the SESSION $ Im = imagecreate (58,28); // generate an image $ Black = imagecolorallocate ($ im, 0); // set the color of the Bar and the following three items $ White = imagecolorallocate ($ im, 255,255,255 ); $ Gray = imagecolorallocate ($ im, 200,200,200 ); $ Red = imagecolorallocate ($ im, 255, 0, 0 ); Imagefill ($ im, $ white); // fill the color of the image // Print the verification code into the image Imagestring ($ im, 5, 10, 8, $ verifyCode, $ black); // write the verification code to the image. For ($ I = 0; $ I <50; $ I ++) // Add interference pixels { Imagesetpixel ($ im, rand () p, rand () 0, $ black); // Add point interferon Imagesetpixel ($ im, rand () p, rand () 0, $ red ); Imagesetpixel ($ im, rand () p, rand () 0, $ gray ); // Imagearc ($ im, rand () p, rand () p, 20, 20, 75,170, $ black); // Add an arc-like interferon // Imageline ($ im, rand () p, $ red); // Add line-like interferon } Imagepng ($ im ); Imagedestroy ($ im ); ?>

Html code

Demo.html

The Code is as follows:
Script Function create_code (){ Document. getElementByIdx_x ('code'). src = 'create _ code. php? '+ Math. random () * 10000; } Script

// Process and determine whether the input is correct
Act. php

The Code is as follows:
Session_start (); If ($ _ POST ['code'] ==_ _ SESSION ['code']) { Echo 'OK '; } Else { Echo 'no '; } ?>