How to pass variables between php scripts?

Is there any way to pass values and variables between php scripts?

Formally, I tried to code a login page and when user enter wrong input first another script will check the input and if it is wrong, site returns to the last script page and show a w开发者_如何学编程arning like "It is wrong input". For this aim, I need to pass values from scripts I guess.

Regards... :P

To pass info via GET:

    header('Location: otherScript.php?var1=val1&var2=val2');

Session:

    // first script
    session_start(); 
    $_SESSION['varName'] = 'varVal';
    header('Location: second_script.php'); // go to other

    // second script
    session_start(); 
    $myVar = $_SESSION['varName'];

Post: Take a look at this.

You should look into session variables. This involves storing data on the server linked to a particular reference number (the "session id") which is then sent by the browser on each request (generally as a cookie). The server can see that the same user is accessing the page, and it sets the $_SESSION superglobal to reflect this.

For instance:

a.php

session_start(); // must be called before data is sent

$_SESSION['error_msg'] = 'Invalid input';

// redirect to b.php

b.php

<?php

session_start();

echo $_SESSION['error_msg']; // outputs "Invalid input"

Can't you include (or include_once or require) the other script?

The quick way would be to use either global or session variables.

global $variable = 'something';

The 'better' way of doing it would be to include the script and pass the variable by parameter like

// script1.php contains function 'add3'
function add3( $value ) {
  return $value + 3;
}

// script2.php
include "script1.php";
echo 'Value is '.add3(2); // Value is 5

I would say that you could also store a variable in cache if you really need.

You can use:

• temporary file (e.g. tempnam()),
• cache (NoSQL: memcached, redis),
• session variable ($_SESSION), but you need to start the session first.

I use extract() method to pass variable among PHP Scripts. It look like below example:

1. File index.php

<?php
$data = [
    'title'=>'hello',
    'content'=>'hello world'
];
extract($data);
require 'content.php';

2. File content.php :

<?php 
echo $title;
echo $content;