How to use variables from php file where require/include is declared

Question

So basically, I have a config.php file for connecting to the mysql database, and a functions.php file that includes some functions. In all my files (eg. index, login, register), I use the line require('config.php'); and inside config.php I have this line require('functions.php'); for including the config + functions together using the line require('config.php'); in my index, login, and register.php files.

So basically my problem is, the variables that I've declared in config.php are not recognized inside functions.php. How do I make it work?

Thanks in advance.

You need to learn about variable scope.

Alex Howansky
– Alex Howansky

2017-07-13 19:47:19 +00:00
Commented Jul 13, 2017 at 19:47 — Alex Howansky
– Alex Howansky, Commented Jul 13, 2017 at 19:47

Trent Three · Accepted Answer · 2017-07-13 19:49:39Z

1

Use the global statement to declare variables inside functions as global variables.

function myfunction() {
  global $myvar;  // $myvar set elsewhere can be read within this function
                  // and if its value changes in this function, it changes globally
}

edited Jul 13, 2017 at 19:49

answered Jul 13, 2017 at 19:47

Trent Three

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2 Comments

aynber Over a year ago

The public keyword is only for use in a class structure.

sadmansh Over a year ago

Thank you so much!

Malus Jan · Accepted Answer · 2017-07-14 11:42:21Z

1

You can use global variavlename or $GLOBAL['variavlename without $']

<?php
$a = 1;
$b = 2;

function Sum()
{
    global $a;
    $a = $a + $GLOBALS['b'];
} 

Sum();
echo $a;
?>

edited Jul 14, 2017 at 11:42

answered Jul 13, 2017 at 19:58

Malus Jan

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Comments

GrumpyCrouton · Accepted Answer · 2017-07-13 20:21:39Z

0

It's very likely your functions don't work because their scope does not include the variables you are trying to use.

First, make sure functions.php is being included after the variables are set

Also, make your functions Public Functions, OR, declare global variables inside functions by doing this:

$testVariable = "test";
function testFunction() {
     global $testVariable;
}

edited Jul 13, 2017 at 20:21

answered Jul 13, 2017 at 19:49

GrumpyCrouton

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1 Comment

GrumpyCrouton Over a year ago

@Sadman If my answer helped you, make sure you check that little check button next to my answer to mark it as correct. Please and thank you :)

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