How can I access a variable inside another function? - php

Question

I have two functions that print some values. I need to use the variable $mv in the second function. However, $mv can only be defined in the first function. I have tried all types of PHP global examples and none of them has allowed the $mv variable to be used or visible or accessible in the second function.
function printMobilePrev(&$mobileprevresults) {
if (count($mobileprevresults->getRows()) > 0) {
$mv = $mobileprevRows[0][0];
$mobileprevRows = $mobileprevresults->getRows();
echo '<p>Previous period (sessions): '.$mobileprevRows[0][0].'..............................';
} else {
print '<p>No results found.</p>';
}
}
function printMobileCurr(&$mobilecurrresults) {
if (count($mobilecurrresults->getRows()) > 0) {
$mobdiff = ($mobcur - $mv);
$mobpctchg = ($mobdiff / $mobprev) * 100;
$mobilecurrRows = $mobilecurrresults->getRows();
echo '<p>Previous period (sessions): '.$mobileprevRows[0][0].'..............................';
echo '<p>Previous period (sessions): '.$mv.'..............................';
echo '<p>Current period (sessions): '.$mobilecurrRows[0][0].'..............................';
if ($mobdiff > 0){
echo '<p>Percent increase: '.$mobpctchg.'..............................';
} else {
echo '<p>Percent decrease: '.$mobpctchg.'..............................';
}
} else {
print '<p>No results found.</p>';
}
}

Answer 1

You can use the global scope:
That is what you want to do:
$mv = 0;
function function1()
{
global $mv;
$mv = 'whatever';
//code
}
function function2()
{
global $mv;
// use $mv;
}

Answer 2

You have to predefine that variable OUTSIDE any function, and then you can use Global to get that to any function.

Answer 3

You can pass it by reference. For example
function doSomething(&$mv) {
$mv = 1;
}
function doSomethingElse($mv) {
return $mv;
}
$mv = 0;
doSomething($mv);
echo doSomethingElse($mv); //Output: 1

Answer 4

You could return $mv after your print and save that in a var to pass to the next function:
$printMobilePrev = printMobilePrev();
function printMobilePrev(&$mobileprevresults) {
$mv = $mobileprevRows[0][0];
...
print '<p>No results found.</p>';
return $mv;
...
}
$printMobileCurr = printMobileCurr(&$mobilecurrresults,$mv);
function printMobileCurr(&$mobilecurrresults,$mv) {
......
}

Answer 5

Most likely you have to make a correct use of globals.
declare your $mv variable as global before asigning it a value on your first function
global $mv;
$mv = $mobileprevRows[0][0];
use global at the begining on your second function before using it
function printMobileCurr(&$mobilecurrresults) {
if (count($mobilecurrresults->getRows()) > 0) {
global $mv;