If isset POST

Question

I have a form on one page that submits to another page  There  it checks if the input mail is filled  If so then do something and if it is not filled  do something else  I don t understand why it always says that it is set  even if I send an empty form  What is missing or wrong   step2 php    lt form name  new user  method  post  action  step2 check php  gt        lt input type  text  name  mail   gt   lt br   gt       lt input type  password  name  password   gt  lt br   gt       lt input type  submit   value  continue   gt   lt  form gt    step2 check   if  isset   POST  mail           echo  Yes  mail is set         else           echo  N0  mail is not set

User · Answer

Lets Think this is your HTML Form in step2.php

step2.php

<form name="new user" method="post" action="step2_check.php"> 
    <input type="text" name="mail"/> <br />
    <input type="password" name="password"/><br />
    <input type="submit"  value="continue"/>
</form>

I think you need it for your database, so you can assign your HTML Form Value to php Variable, now you can use Real Escape String and below must be your

step2_check.php

if(isset($_POST['mail']) && !empty($_POST['mail']))
{
$mail = mysqli_real_escape_string($db, $_POST['mail']);
}

Where $db is your Database Connection.

User · Answer

-POST METHOD  if we use POST method in the form tag to pass data we can find data in the server using   POST array using this array name we fetch data from server    POST  name   Information sent from a form with the POST method is invisible to others all names values are embedded within the body of the HTTP request  and has no limits n the amount of information to send  Example Code   lt html gt   lt head gt   lt  head gt   lt body gt   lt  php if isset   POST  submit      if isset   POST  name     amp  amp  isset   POST  roll      echo quot  lt h1 gt form submitted lt  h1 gt  quot  echo quot your name is quot     POST  name    quot  lt br gt  quot   echo  quot your roll number is quot     POST  roll    quot  lt br gt  quot     else   gt   lt form action  quot  quot  method  quot POST quot  gt  Name  lt input type  quot text quot  name  quot name quot  gt  lt br gt  lt br gt  Roll  lt input type  quot text quot  name  quot roll quot  gt  lt br gt   lt br gt  lt input type  quot submit quot  value  quot submit quot  name  quot submit quot  gt   lt  form gt   lt  php   gt   lt  body gt   lt  html gt

User · Answer

Most form inputs are always set  even if not filled up  so you must check for the emptiness too   Since  empty   is already checks for both  you can use this   if   empty   POST  mail           echo  Yes  mail is set         else         echo  No  mail is not set

User · Answer

Use  empty instead of isset  isset return true for   POST because   POST array is superglobal and always exists  set    Or better use   SERVER  REQUEST METHOD       POST

User · Answer

Check to see if the FORM has been submitted first  then the field   You should also sanitize the field to prevent hackers   form name  new user  method  post  action  step2 check php  gt        lt input type  text  name  mail   gt   lt br   gt       lt input type  password  name  password   gt  lt br   gt       lt input type  submit   id  SubmitForm  name   SubmitForm  value  continue   gt   lt  form gt    step2 check    if  isset   POST  SubmitForm              Email    sanitize text field stripslashes   POST  SubmitForm         if  empty  Email        echo  Yes  mail is set       else      echo  N0  mail is not set

User · Answer

lt  php     if isset   POST  mail     amp  amp    POST  mail                  echo  Yes  mail is set        else          echo  N0  mail is not set           gt

User · Answer

To answer the posted question  isset and empty together gives three conditions  This can be used by Javascript with an ajax command as well    errMess  Didn t test        This message should not show if isset   POST  foo         does it exist or not      foo     POST  foo       save  foo from POST made by HTTP request     if empty  foo            exist but it s null          errMess  Empty       1 Nothing in  foo it s emtpy        else                   exist and has data          errMess  None        2 Something in  foo use it now           else                       couldn t find  foo dataHere       errMess  Missing        3 There s no foo in request data      echo  Was there a problem     errMess

User · Answer

Maybe you can try this one   if  isset   POST  mail     amp  amp     POST  mail     0     echo  Yes  mail is set     else   echo  No  mail is not set

User · Answer

You can try this   if  isset   POST  mail        false        echo  Yes  mail is set        else        echo  N0  mail is not set

User · Answer

If you send the form empty    POST  mail   will still be sent  but the value is empty  To check if the field is empty you need to check   if isset   POST  mail     amp  amp  trim   POST  mail

User · Answer

Use  empty   instead of isset    Because isset   will always return true in your case   if   empty   POST  mail           echo  Yes  mail is entered         else         echo  No  mail is not entered

User · Answer

From php net  isset      Returns TRUE if var exists and has value other than NULL  FALSE   otherwise    empty space is considered as set  You need to use empty   for checking all null options

User · Answer

You can try     lt  php       if  isset   POST  mail                   echo  Yes  mail is set                else                echo  N0  mail is not set                 gt

User · Answer

Add the following attribute to the input text form  required  required   If the form is not filled  it will not allow the user to submit the form   Your new code will be    lt form name  new user  method  post  action  step2 check php  gt    lt input type  text  name  mail  required  required   gt   lt br   gt   lt input type  password  name  password  required  required   gt  lt br   gt   lt input type  submit   value  continue   gt    if  isset   POST  mail           echo  Yes  mail is set

User · Answer

lt form name  new user  method  post  action  step2 check php  gt      lt input type  text  name  mail  required  required   gt   lt br   gt     lt input type  password  name  password  required  required   gt  lt br   gt     lt input type  submit   value  continue   gt   lt  form gt    lt  php if   empty   POST  mail           echo  Yes  mail is set        else        echo  N0  mail is not set       gt

User · Answer

You can simply use   if   POST  username   and   POST  password        username     POST  username       password     POST  password        Alternatively  use empty    if  empty   POST  username    and  empty   POST  password         username     POST  username       password     POST  password

[php] If isset $_POST

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