Checking if form has been submitted - PHP

Question

What is the best way of checking whether or not a form has been submitted to determine whether I should pass the form s variables to my validation class   First I thought maybe   isset   POST    But that will always return true as a superglobal is defined everywhere  I don t want to have to iterate through each element of my form with   if isset   POST  element1       isset   POST  element2       isset    etc   Whilst writing this question I thought of a much more basic solution  add a hidden field to act as a flag that I can check   Is there a  cleaner  way to do it than adding my own flag

User · Answer

Try this       lt form action    method  POST  id  formaddtask  gt        Add Task   lt input type  text name  newtaskname    gt         lt input type  submit  value  Submit   gt    lt  form gt         Check if the form is submitted     if   SERVER  REQUEST METHOD       POST   amp  amp   empty   POST  newtaskname

User · Answer

How about   if   SERVER  REQUEST METHOD       POST

User · Answer

On a different note  it is also always a good practice to add a token to your form and verify it to check if the data was not sent from outside   Here are the steps    Generate a unique token  you can use hash  Ex     token   hash  string  algo   string  data    bool  raw output   FALSE       Assign this token to a session variable  Ex      SESSION  form token      token   Add a hidden input to submit the token  Ex    input type  hidden  name  token  value    token    then as part of your validation  check if the submitted token matches the session var    Ex  if     POST  token         SESSION  form token

User · Answer

Use  if isset   POST  submit        name of your submit button

User · Answer

Actually  the submit button already performs this function   Try in the FORM    lt form method  post  gt   lt input type  submit  name  treasure  value  go   gt   lt  form gt    Then in the PHP handler   if  isset   POST  treasure      echo  treasure will be set if the form has been submitted  to TRUE  I believe

User · Answer

I had the same problem - also make sure you add name    in the input button  Well  that fix worked for me     if   SERVER  REQUEST METHOD       POST   amp  amp   empty   POST  add          echo  stuff is happening now       lt input type  submit  name  add  value  Submit  gt

User · Answer

For general check if there was a POST action use    if   empty   POST     EDIT  As stated in the comments  this method won t work for in some cases  e g  with check boxes and button without a name   You really should use   if    SERVER  REQUEST METHOD       POST

User · Answer

You could also use   is array   POST

User · Answer

if    SERVER  REQUEST METHOD       POST

[php] Checking if form has been submitted - PHP

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