Comments on: Which PHP Logical Operator Is Better – ‘and’ or ‘&&’?

By: This Life of Brian » Blog Archive » Binary Code and Bitwise Operators (in PHP)

Tue, 11 Nov 2008 21:41:37 +0000

[...] recognize them. If you don’t know what they are, it is easy to confuse them with the standard logical operators – || and [...]

By: Binary Code and Bitwise Operators (in PHP) | Web Cash

Binary Code and Bitwise Operators (in PHP) | Web Cash — Mon, 07 Apr 2008 02:30:20 +0000

[...] recognize them. If you don’t know what they are, it is easy to confuse them with the standard logical operators – || and [...]

By: Walkere

Walkere — Mon, 07 Apr 2008 01:37:05 +0000

Yes, the same will apply to || and ‘or’.

However, it’s important to note that the ‘&’ operator is quite different from the ‘&&’ operator. The same goes for ‘|’ and ‘||’.

‘&’ and ‘|’ are bitwise operators. They compare the bits of two items and return either the intersection of those bits (&) or the union of those bits (|).

For example, 7 can be written as 0000 0111 and 17 can be written as 0001 0001.

7 & 17 = 0000 0001 (or 1)

7 | 17 = 0001 0111 (or 23)

By: Atli

Atli — Sun, 06 Apr 2008 20:00:38 +0000

Very interesting. I always assumed ‘&&’ and ‘and’ (as well as ‘&’) were the same thing, just dressed up differently.

It is also worth mentioning that the rules explained here appear to apply to the ‘||’ and ‘or’ operators as well.