PHP - passing variable from one PHP file to another PHP file

Question

I am new to PHP and trying to pass variable from one page to another page. Initially, I have a HTML page which contains the frames as below.

<!DOCTYPE html>
<html>

<frameset cols="70%,*">
  <frame src="index.php">
  <frame src="slider.php">
</frameset>
</html>

As seen above, I have 2 PHP pages, in which am trying to send some values from index.php file to my slider.php file. My index.php file is as below.

<?php
$names = file('demo.csv');
$page = $_GET['page'];
$pagedResults = new Paginated($names, 20, $page);
$handle = fopen('demo.csv', 'r');
  if (($data = fgetcsv($handle, 1000, ',')) !== FALSE)
    {
    }
echo "<table border='3' bgcolor='#dceba9' style='float:center; margin:50'>";
echo '<tr><th>'.implode('</th><th>', $data).'</th></tr>';
while ( $row = $pagedResults->fetchPagedRow())
{
    echo "<tr><td>";
    $row1 = str_replace( ',', "</td><td>", $row );
    echo $row1;
    echo "</td></tr>";
}
fclose($handle);
echo "</table>";
//important to set the strategy to be used before a call to fetchPagedNavigation
$pagedResults->setLayout(new DoubleBarLayout());
echo $pagedResults->fetchPagedNavigation();
?>
<form method="get" action="slider.php">
    <input type="hidden" name="totalcolumns" value="3">
    <input type="submit">
</form>

This is my slider.php file.

<?php 
      $totalcolumns = $_GET['totalcolumns'];
      echo "My next value should get printed";
      echo $totalcolumns;
?>

  <input type="text" data-slider="true" data-slider-range="100,500" data-slider-step="100">
</html>

As seen above, I am trying to retrieve the value with the name "totalcolumns". However, I am not able to retrieve the value in my slider.php file. I also tried using SESSION as suggested in this link, but no luck. Can someone please let me know what am doing wrong?

One security-related aspect: you should escape the GET variable totalcolumns when outputting: echo htmlspecialchars($totalcolumns); — ComFreek
– ComFreek, Commented Oct 1, 2013 at 21:11
I guess your problem is that you do not know for sure which is called first — Gar
– Gar, Commented Oct 1, 2013 at 21:11
you might want to avoid the use of frames alltogether, as PHP + JavaScript is combo quite capable of replacing them in an accessible manner.. just btw :P — Zathrus Writer
– Zathrus Writer, Commented Oct 1, 2013 at 21:11
@Gar, I think that might be the problem. Do you know how can I resolve that issue? Thanks! — ram esh
– ram esh, Commented Oct 1, 2013 at 21:13
The main problem is frames. Period. The world has moved on. Your problem is easily solved with ajax and a proper callback. — nietonfir
– nietonfir, Commented Oct 1, 2013 at 21:52

fos.alex · Accepted Answer · 2013-10-01 21:16:38Z

3

You should be able to use the $_SESSION. This is:

$_SESSION['totalcolumns'] = $columns --> your value here in the first script

your value will be stored in the $columns variable in the second 
 $columns = $_SESSION['totalcolumns']

You can also review the require or include functions. These functions make one file depend on another one, it is as if you directly paste one file on the other. It is not a good practice to pass variables with these functions. You should use Session

http://php.net/manual/en/function.require.php

Btw, don't use framesets

answered Oct 1, 2013 at 21:16

fos.alex

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Comments

inf3rno · Accepted Answer · 2013-10-01 21:14:40Z

1

You should use sessions and you should not use html framesets or iframes, it is a bad practice. If you don't want to reload the whole page by any change, you should use javascript.

answered Oct 1, 2013 at 21:14

inf3rno

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2 Comments

ram esh Over a year ago

Yeah, I think I can use sessions. However, as @Gar pointed out, the system doesn't know which PHP file is called first. I am not sure how to resolve this problem as I am using HTML frames to create 2 separate frames for both these PHP files at the same time.

inf3rno Over a year ago

As I said don't use frames, they are not capable of what you want. Use a single html page instead of that which contains the data both of your index.php and slider.php files.

Dinesh · Accepted Answer · 2013-10-01 21:21:01Z

1

You can use $_REQUEST instead of $_GET or just it as:

<?php
if(array_key_exists('totalcolumns', $_GET)) {
      $totalcolumns = $_GET['totalcolumns'];
      echo "My next value should get printed";
      echo $totalcolumns;
?>

may this help you

answered Oct 1, 2013 at 21:21

Dinesh

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Comments

Gar · Accepted Answer · 2013-10-01 21:29:53Z

i'd id the frames first, removing the src for the second one

<!DOCTYPE html>
<html>

<frameset cols="70%,*">
  <frame src="index.php" id="f1">
  <frame src="" id="f2">
</frameset>
</html>

then change the index.php adding this piece of code at the end

<script>
parent.frames['f2'].location.href="slider.php?totalcolumns=3";
</script>

or perhaps if you have the totalcolumns in your php

<script>
parent.frames['f2'].location.href="slider.php?totalcolumns=<?php echo $totalcolumns;?>";
</script>

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