Here's how I think about it... CREATE_RECORDS = 1 in decimal and 0001 in binary. ALTER_RECORDS = 4 in decimal and 0101 in binary.
that line returns a binary string where *any* of the bits are 1, so line them up: 0001 | 0101 = 0101 which is 5. On Mon, 3 Mar 2003, Dan Sabo wrote: > Hi, > > I'm reading the description of Bitwise Operators on page 81 of "Professional > PHP 4", the Wrox book. In the highlighted example on that page, the line of > code... > > $user_permissions = CREATE_RECORDS | ALTER_RECORDS; > > the description in the book says that this line is building a set of user > permissions out of the previously created constants with the OR operator (I > understand what OR means). The value of $user_permissions is set to either > 1 or 4, which is in fact 5 (0101). But how is this single line doing that? > The explanation was cryptic (to me). > > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
