Question

How to use global variable in PHP

Answer 1

$n = 10; // global variable

function f() 
{
    global $n; // use global keyword
    
    echo $n . "<br />";
}

f();

$n = 20;
echo $n . "<br />";
 
/*
run:

10
20
 
*/

 

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Answer 2

function mul($a, $b) 
{
    $GLOBALS['m'] = $a * $b;
}
 
mul(2, 3);
echo $m; 

 
/*
run:
 
6
 
*/

 

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Answer 3

$a = 3;
$b = 2;

function mul() 
{
    $GLOBALS['m'] = $GLOBALS['a'] * $GLOBALS['b'];
}
 
mul();
echo $m; 

 
/*
run:
 
6
 
*/

 

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