Global and Local scopes and Static variables in PHP, globalstatic_PHP tutorial

Global and Local scopes and Static variables in PHP, globalstatic

1. Local scope

function update_counter()

{

$counter++;//$counter here is a local variable, which is different from the $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 the function to obtain 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;//Use the static keyword to declare $counter, which has a local domain

$counter++;

echo "Static counter is now $countern";

}

$counter = 10;

update_counter();

update_counter();

echo "Global counter is $countern";

/*Output:

Static counter is now 1

Static counter is now 2

Global counter is 10

*/

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