how to use $_POST to post a php variable

Question

I have a php variable "echo $id". Now I want to use the $_POST method to post the variable. I just want to know how to do this for a variable because $_POST[$id] does not work? I want the $id to be posted from the form into another page.

Below is my function where the $id is in:

function id_generator(){ 

          $id = ""; 
          $a = array( "A" , "B"); 

      for( $i = 0 ; $i < 3 ; $i++ ){ $r = rand( 0 , 25 );
       $id .= $a[ $r ]; 

   }

   return $id;
}

Below is the form:

         <form action="QandATable.php" method="post" id="sessionForm">
         <p><strong>1: Your Session ID: </strong><?php echo $id; ?></p>
</form>

Thanks

possible duplicate of I want to post a php variable from a form — Quentin
– Quentin, Commented Dec 17, 2011 at 14:06

obmarg · Accepted Answer · 2011-12-17 14:06:31Z

3

You need to put the id into a form input field. For example, to put it in a hidden input:

<form action="QandATable.php" method="post" id="sessionForm">
     <p><strong>1: Your Session ID: </strong><?php echo $id; ?></p>
     <input type='hidden' name='id' value='<?php echo $id; ?>' />
</form>

Then after the user clicks a submit button (which you will also need to add to the form), in QandATable.php you can just go

$id = $_POST["id"]

to get the id.

answered Dec 17, 2011 at 14:06

obmarg

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Comments

Krzysztof · Accepted Answer · 2011-12-17 14:10:14Z

$_POST variable keeps values passed via POST method. But in your code I don't see any fields in form that can handle this value. You should create input, select or textarea inside <form> tag. Then after submit $_POST will be filled with values of this fields. Key in $_POST array will come from name attribute and value will be value of field. You probably want to use $_SESSION variable in this case. With $_SESSION variable is remembered on server.

$_SESSION['id'] = id_generator(); // to set
echo $_SESSION['id']; // to use

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