PHP bitwise AND OR (^, &)

Today, friends in a group of friends asked the next bit and or question.

PHP has been working for 1 years, maybe not quite familiar with this piece. Introduce this part to the novice friend here

Pressing is located primarily on binary number operations.

This is not a purely additive relationship.

Decimal 1 converted to binary 00000001

Decimal 2 converted to binary 00000010

The bitwise ^ 00000011//Is different is counted as 1 ^_^

And then

Decimal 3 converted to binary 00000011

Decimal 1 converted to binary 00000001

Bitwise & 00000001//Is the same as each single digit, otherwise it will be counted as 0

Finally introduce the following usage; The bitwise & return value is meaningless. It is mainly used to determine if $ A is present in $c//permission usage is much more.

 
  ' Increase ', 4=> ' delete ',2=> ' to ',1=> '); foreach ($privilege _arr as $k = $v) {  $k & $my _privilege &&  $Pri. = ' I have '. $v. ' Power
';} Echo $Pri;? >

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