Bitwise and/or operations in PHP

Bitwise and operations are mainly performed on binary numbers. The code is as follows: [php] & lt ;? Php $ a = 1; $ B = 2; $ c = $ a ^ B; echo $ c3? & Gt; here we do not simply convert the addition relationship decimal 1 to binary 00000001 decimal 2 to binary 00000010 bitwise and mainly operate on binary numbers. The code is as follows: [php] Here we do not simply convert the add-on relationship decimal 1 to binary 00000001 decimal 2 to binary 00000010 ^ 00000011 by bit // the values of different values are regarded as 1 ^. then, [html] Convert decimal 3 to binary 00000011 decimal 1 to binary 00000001 bitwise & 00000001 // it means that each digit remains the same; otherwise, it is regarded as 0; the return value after bitwise & is meaningless. It is mainly used to determine whether $ a exists in $ c. // There are many permission usage options. [Html] 'Add', 4 => 'Delete', 2 => 'change', 1 => 'query'); foreach ($ privilege_arr as $ k => $ v) {$ k & $ my_privilege & $ Pri. = 'I '. $ v. 'Power
';} Echo $ Pri;?>