获取发送的参数数量

Question

My php file will recive one of two forms. One contains 2 inputs, the other contains one. Is there a way to get which one of the two was submited based on the number of arguments sent?

    <form action="a.php" method="post">
    <input type="text" name="firstA" />
    <input type="text" name="secondA" />
    <input type="submit" name="submitbutton" />
    </form>

    <form action="a.php" method="post">
    <input type="text" name="B" />
    <input type="submit" name="submitbutton" />
    </form>



<?php
  $number = "number of arguments" 
?>

Answer 1

I'd rather advice you to use hidden input for this purposes, like:

<form action="a.php" method="post">
  <input type="text" name="firstA" />
  <input type="text" name="secondA" />
  <input type="submit" name="submitbutton" />
  <input type="hidden" name="formName" value="formA" />
</form>

<form action="a.php" method="post">
  <input type="text" name="B" />
  <input type="submit" name="submitbutton" />
  <input type="hidden" name="formName" value="formB" />
</form>

And your php code will look like this:

if ($_POST['formName'] === 'formA') { handleFormA(); }
if ($_POST['formName'] === 'formB') { handleFormB(); }

But if you wish to rely on count of arguments you can to do something like:

if (count($_POST[]) === 3) { handleFormA(); }
if (count($_POST[]) === 1) { handleFormB(); }

Answer 2

That is a very dangerous way of deciding which form has been posted. What if in 3 months you geta request to add another field to the form with 2 fields. Then they both have 3 fields.

All you need to do is give the button on each form a unique name like this

<form action="a.php" method="post">
    <input type="text" name="firstA" />
    <input type="text" name="secondA" />
    <input type="submit" name="submitbutton1" />
</form>

<form action="a.php" method="post">
    <input type="text" name="B" />
    <input type="submit" name="submitbutton2" />
</form>

Now in your PHP you can check for the existance of the button and you will know which form you are processing

<?php

    if ( isset($_POST['submitbutton1']) ) {
        // I am processing form 1
    }

    if ( isset($_POST['submitbutton2']) ) {
        // I am processing form 2
    }

Answer 3

you can also try:

<form action="a.php" method="post">
  <input type="text" name="firstA" />
  <input type="text" name="secondA" />
  <input type="submit" name="submitbutton" />
  <input type="hidden" name="formAinputname" value="formA" />
</form>

<form action="a.php" method="post">
  <input type="text" name="B" />
  <input type="submit" name="submitbutton" />
  <input type="hidden" name="formBinputname" value="formB" />
</form>

you not need check hidden input value you can check by input name like below:

if( array_key_exists( 'formAinputname', $_POST ) )
{
  handleFormA();
}

if( array_key_exists( 'formBinputname', $_POST ) )
{
    handleFormB();
}