PHP uses tokens to prevent forms from repeating submissions, token form _php tutorial

PHP uses token to prevent the form from repeating the submission method, token form

The example in this article describes how PHP uses tokens to prevent forms from repeating submissions. Share to everyone for your reference, as follows:

<?php/** PHP uses tokens to prevent forms from repeating a form * This processing method is purely for beginners ' reference */session_start (); function Set_token () {  $_session[' token '] = MD5 (Microtime (TRUE));} function Valid_token () {  $return = $_request[' token '] = = = $_session[' token ']? true:false;  Set_token ();  return $return;} Generates a tokenif (!isset ($_session[' token ') "If token is empty) | | $_session[' token ']== ') {  set_token ();} if (isset ($_post[' test ')) {  if (!valid_token ()) {    echo "token error";  } else{    Echo ' successfully submitted, Value: '. $_post[' test ';  }}? >

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I hope this article is helpful to you in PHP programming.

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