How to keep already-set GET parameter values on form submission?

Question

I have a URL : foo.php?name=adam&lName=scott, and in foo.php I have a form which gives me values of rectangleLength & re

Answer 1

A simpler solution to keep the URL unchanged by using http_build_query

 <form action="<?php echo $_SERVER["PHP_SELF"] . '?'.http_build_query($_GET); ?>" ... 
  ..
  ..

Answer 2

There are different ways to do this. All of them write the parameters they receive into a file, memory, or a database and retrieve them later with a key

The easiest method is something like a session variable: http://php.net/manual/en/features.sessions.php

The main setup is something like this (caution: that is unsecure code, make sure you only add session variables you want to keep, and sanitize user input!):

<?php
session_start();
foreach ($_GET as $key=>$value) {
    $_SESSION[$key]=>$value;
}

?>

and now, as long as the user does not close the browser, you can access these variables with $_SESSION[varname];

Answer 3

My personal preference would be to specify the keys you wish to accept and be sure to run the value through htmlspecialchars().

$url_params = array(
  'tab'
);
foreach( $url_params as $key ) {
  echo !empty( $_GET[$key] ) ? '<input type="hidden" name="'. $key .'" value="'. htmlspecialchars( $_GET[$key] ) .'" />' : '';
}

Answer 4

You can add two hidden fields in the form on the first target site, blabla.php in your case:

<form ...>
  <input type="hidden" name="name" value="<?php echo htmlspecialchars($_GET['name']);?>">
  <input type="hidden" name="lName" value="<?php echo htmlspecialchars($_GET['lName']);?>">

  <!-- rest of the form here -->
</form>

For a dynamic solution, use a foreach loop:

<?php
foreach($_GET as $name => $value) {
  $name = htmlspecialchars($name);
  $value = htmlspecialchars($value);
  echo '<input type="hidden" name="'. $name .'" value="'. $value .'">';
}
?>

You may consider locking the dynamic approach down to a list of known possible keys:

<?php
$keys = array('name', 'lName', ...);
foreach($keys as $name) {
  if(!isset($_GET[$name])) {
    continue;
  }
  $value = htmlspecialchars($_GET[$name]);
  $name = htmlspecialchars($name);
  echo '<input type="hidden" name="'. $name .'" value="'. $value .'">';
}
?>

Answer 5

1. In menu (calling html) I call VendorSearch.php. variable fromvs is used in URL.
2. The target php VendorSearch.php will do different jobs based on the value of $_GET['fromvs']

3. In VendorSearch.php, aftersession_start(),

   $srchfor =""; $fromwhat = $_GET['fromvs']; $_SESSION['fromwhat'] = $fromwhat; $vs = $fromwhat;

4. Use hidden input to store URL passed variable

   <div style='position: absolute; top: 10px; left: 400px;'><input type='hidden' hidden='hidden' id='fromvs' name='fromvs' value="<?php echo $_SESSION['fromwhat']; ?>"></div>

5. But this thie

Segment in Calling html .... Add a Subcontractor