Global and local scopes and static variables in PHP

1. Local Scope

function Update_counter ()

{

$counter ++;//here $counter as a local variable, not the same as $counter outside the function

}

$counter = 10;

Update_counter ();

Echo $counter;

Output: 10

2. Global Scope

function Update_counter ()

{

Global $counter;//Use the Global keyword to declare within a function to get the $counter of the global domain

$counter + +;

}

$counter = 10;

Update_counter ();

Echo $counter;

Output: 11

function Update_counter ()

{

$GLOBALS [counter]++;

}

$counter = 10;

Update_counter ();

Echo $counter;

Output: 11

3. Static variables

function Update_counter ()

{

Static $counter = 0;//declared with the static keyword $counter, with local domain

$counter + +;

echo "Static counter is now $counter \ n";

}

$counter = 10;

Update_counter ();

Update_counter ();

echo "Global counter is $counter \ n";

/* Output:

Static counter is now 1

Static counter is now 2

Global counter is 10

*/

Global and local scopes and static variables in PHP