Question

What the bitwise operators allow in PHP

Answer 1

Example           Operation              Result 
-------           ---------              ------ 

$a & $b           And                    Bits that are set in both $a and $b are set
$a | $b           Or                     Bits that are set in either $a or $b are set
$a ^ $b           Xor                    Bits that are set in $a or $b but not in both 
~$a               Not                    Bits that are set in $a are not set, and vice versa
$a << $b          Shift left             Shift the bits of $a to left, $b steps (each step means "x2") 
$a >> $b          Shift right            Shift the bits of $a to right, $b steps (each step means "/2") 

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