Bit operations in PHP

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$a & $b	and (Bitwise AND)	Set the 1 bit to 1.
$a | $b	or (bitwise OR)	Set the bit with any of the 1 to 1.
$a ^ $b	XOR (Bitwise XOR)	Set the bit to 1 and the other 0 to 1.
~ $a	Not (bitwise negate)	Set the bit in 0 to 1, and vice versa.
$a << $b	Shift left	Moves the bits in the left (each move represents "multiplied by 2").
shift Right (move to the left)	Moves the bit to the right (each move represents "divided by 2").