Question

How to access global variable from a function in PHP

Answer 1

$GLOBALS['disk_size'] = "5TB";
   
function func() 
{
    echo $GLOBALS['disk_size'] . "<br />";
}

echo $GLOBALS['disk_size'] . "<br />";
func();

$GLOBALS['disk_size'] = "10TB";

echo $GLOBALS['disk_size'] . "<br />";
func();
 
/*
run:

5TB
5TB
10TB
10TB

*/

 

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Answer 2

$GLOBALS['disk_size'] = "5TB";
   
function func() 
{
    echo $GLOBALS['disk_size'] . "<br />";
    $GLOBALS['disk_size'] = "10TB";
}

echo $GLOBALS['disk_size'] . "<br />";
func();

echo $GLOBALS['disk_size'] . "<br />";
func();
 
/*
run:

5TB
5TB
10TB
10TB

*/

 

70+ SQL courses for beginners and professionals

Answer 3

$disk_size = "5TB";
   
function func() 
{
    global $disk_size;
    
    echo $disk_size . "<br />";
}

echo $disk_size . "<br />";
func();

$disk_size = "10TB";

echo $disk_size . "<br />";
func();
 
/*
run:

5TB
5TB
10TB
10TB

*/

 

70+ SQL courses for beginners and professionals

Answer 4

$disk_size = "5TB";
   
function func() 
{
    global $disk_size;
    
    echo $disk_size . "<br />";
    
    $disk_size = "15TB";
}

echo $disk_size . "<br />";
func();

echo $disk_size . "<br />";
func();
 
/*
run:

5TB
5TB
15TB
15TB

*/

 

70+ SQL courses for beginners and professionals