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php best practice programming example with globle keyword

php best practice programming example with globle keyword


<?php
$a = 0;
$b = 2;

function s()
{
    global $a;

    $a += 1 ;
    return $a;
}

function m()
{
    global $a;

    $a -= 1 ;
    return $a;
}

s();
m();
s();
s();
s();
s();
s();
s();
m();
echo $a;

 ?>

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