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What's the difference between & and && by AnakinPt
Posted: 8 Jan 02

in the following piece of code:

$a=10 ; //(1010b)
$b = 0; // (0000b)

if ($a & $b)

is different from

if ($a && $b)

The first one is true and the second if false.

When we use only one & it means bit-by-bit and operation, so $a & $b=10 (1010b), while when you use && it means and operator of clauses and in this case $a && $b = 0, cause $b=0.

Beware of the signs. This FAQ is also valid for the or operator ('|').

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