Php implements an operational verification code, and php operation verification code _ PHP Tutorial

Php implements an operational verification code and a php verification code. Php implements an operational verification code. This article shares an example of php code that implements an operational verification code, hoping to help you learn this. Demo. php code phpsessio php implements a verifiable verification code and a php verification code

This article shares a code example for php to implement an operational verification code, hoping to help you learn it.

Demo. php code

<?php session_start(); if(!emptyempty($_POST['Login'])){   if(md5(strtoupper($_POST['Login'])) == $_SESSION['Login']){     echo 'Correct';   }else{     echo 'Error';     } } ?>   

Img. php code

<? Php session_start ();/*** random number, sum verification code * modification date */function getCode ($ length = 32, $ mode = 0) {switch ($ mode) {case '1': $ str = '000000'; break; case '2': $ str = 'abcdefghijklmnopqrstuvwxyz '; break; case '3 ': $ str = 'abcdefghijklmnopqrstuvwxy'; break; case '4': $ str = 'authorization'; break; case '5': $ str = 'abcdefghijklmnpqrstuvwxyz123456789 '; Break; case '6': $ str = 'abcdefghijklmnopqrstuvwxyz1234567890 '; break; default: $ str = 'authorization'; break;} $ result = ''; $ l = strlen ($ str)-1; for ($ I = 0; $ I <$ length; $ I ++) {$ num = rand (0, $ l); $ result. = $ str [$ num];} return $ result;} // Create a verification image function createAuthNumImg ($ randStr, $ imgW = 100, $ imgH = 40, $ fontName) {header ("content-type: image/png "); $ Image = imagecreate ($ imgW, $ imgH); $ color_white = imagecolorallocate ($ image, 255,255,255); $ color_gray = imagecolorallocate ($ image, 228,228,228 ); $ color_black = imagecolorallocate ($ image, 255,102,204); for ($ I = 0; $ I <1000; $ I ++) {imagesetpixel ($ image, mt_rand (0, $ imgW), mt_rand (0, $ imgH), $ color_gray);} imagerectangle ($ image, 0, 0, $ imgW-1, $ imgH-1, $ color_gr Ay); for ($ I = 10; $ I <$ imgH; $ I + = 10) imageline ($ image, 0, $ I, $ imgW, $ I, $ color_gray); imagettftext ($ image, 16,5, 3,25, $ color_black, $ fontName, $ randStr); for ($ I = 10; $ I <$ imgW; $ I + = 10) imageline ($ image, $ I, 0, $ I, $ imgH, $ color_gray); imagepng ($ image); imagedestroy ($ image );} $ a = GetCode (1, 1); $ B = GetCode (1, 1); $ c = GetCode (1, 1); $ Passport = $. "+ ". $ B. "+ ". $ c; $ Total = $ a + $ B + $ c; $ Total; $ _ SESSION [$ _ GET ['action'] = md 5 (strtoupper ($ Total); createAuthNumImg ($ Passport, $ _ GET ['img'], $ _ GET ['imgh'], "verdana. ttf ");?>

The above is all the codes of php verifiable verification codes introduced to everyone. I hope this will help you learn more.

This article shares the code example for php to implement an operational verification code. I hope this will be helpful for your learning. Demo. php code php sessio...