This question already has an answer here:
i'm new here and i have a question that i couldn't find an answer to:
<?php
$val1 = 25;
$val2 = 15;
echo ($value & $value1); // output : 9
?>
Can anyone explain step by step how this returned 9 ?
Thank you
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& operator works with binary representation of a number:
25 is 00011001 15 is 00001111
00011001
&
00001111
--------
00001001
Which is 9 in decimal.
& is an AND operator. It's sort of like &&, but applies to binary numbers.
25 = 00011001
15 = 00001111
.....& 00001001 which in binary is 9
Basically, only the bits that are 1 in both the first and second number remain 1, the rest turn to 0.