Question

How to double a variable fast with bitwise shift left in PHP

Answer 1

$val = 8;
$val = $val << 1;

echo $val;


/*
run:

16

*/

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Answer 2

$val = 2;
for ($i = 1; $i <= 5; $i++)  {
    $val = $val << 1;
    echo $val . " "; 
}


/*
run:

4 8 16 32 64 

*/

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