PHP file_get_contents Syntax

Question

I have successfully setup an HTML form in PHP File #1, and it is successfully posting the form data to PHP File #2. Now what I'm trying to do is take the posted data from PHP File #2 and store it as a variable in a new file, called PHP File #3. In this situation, the user will be submitting a search string through an input field, and all I want to do is use that information to be stored as a variable for later use in an external PHP file.

So let's say the user submits "John Smith" through the input field. Right now, "John Smith" will get posted to PHP File #2 (it's also turned into a variable there, called '$query'. So then I simply want to create the same variable in a 3rd PHP File (also called '$query') and have the contents from the form be stored in it. But since it's from an external source I don't know the exact syntax on how to do this.

If someone could just show a generic example of this for pulling the info from the 2nd PHP file, that would be the most helpful. I'm pretty sure we would use file_get_contents, but I don't understand how to pull a specific piece of info from a variable in the 2nd PHP file.

It seems you are suggesting physically editing the 2nd php file to store variable contents...which is not a good thing to do. You could either use something like a text file to store information temporarily, or utilize sessions. — Sean Carruthers
– Sean Carruthers, Commented Feb 24, 2012 at 19:48

simshaun · Accepted Answer · 2012-02-24 19:54:41Z

2

One of the most common ways of handling this is to store the data you need in a session on page #2, and pull it from session on page #3.

e.g. (barebones example)

page 2

<?php
session_start();
$query = isset($_POST['query']) ? trim($_POST['query']) : false;

if (false === $query)
    throw new Exception('Missing query.');

// Do whatever you need to with it.

$_SESSION['query'] = $query;

page 3

<?php
session_start();
$query = isset($_SESSION['query']) ? $_SESSION['query'] : false;

if (false === $query)
    throw new Exception('Missing query.');

edited Feb 24, 2012 at 19:54

answered Feb 24, 2012 at 19:50

simshaun

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2 Comments

Rob Myrick Over a year ago

Hi Shaun, this seems to make sense. I actually had done something like this with file #2 (without a session) that simply echoed the query in an iframe and it worked. But now when I try adding a session and still echoing the query it's not showing up in the iframe - it's showing ie error that webpage can't be displayed. Any thoughts why this may be?

simshaun Over a year ago

Do you have any output (even a single space will do it) before calling session_start()?

Makc · Accepted Answer · 2012-02-24 20:03:03Z

1

You can use sessions to do this. For example:

1.php code:

$data= 'somekind of data';
session_start();
$_SESSION['value']= $data;

2.php code:

session_start();
echo(isset($_SESSION['value']))? $_SESSION['value'] : 'Nothing Found';

http://lv.php.net/manual/en/function.session-start.php

P.s. Read something about PHP cookies and sessions

answered Feb 24, 2012 at 20:03

Makc

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