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Editorial Team
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Asked: 2026-05-13T14:11:37+00:00

I understand that bitwise operations are necessary for much low-level programming, such as writing

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I understand that bitwise operations are necessary for much low-level programming, such as writing device drivers, low-level graphics, communications protocol packet assembly and decoding. I have been doing PHP for several years now, and I have seen bitwise operations very rarely in PHP projects.

Can you give me examples of usage?

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  1. Editorial Team

    You could use it for bitmasks to encode combinations of things. Basically, it works by giving each bit a meaning, so if you have 00000000, each bit represents something, in addition to being a single decimal number as well. Let’s say I have some preferences for users I want to store, but my database is very limited in terms of storage. I could simply store the decimal number and derive from this, which preferences are selected, e.g. 9 is 2^3 + 2^0 is 00001001, so the user has preference 1 and preference 4.

     00000000 Meaning       Bin Dec    | Examples
 │││││││└ Preference 1  2^0   1    | Pref 1+2   is Dec   3 is 00000011
 ││││││└─ Preference 2  2^1   2    | Pref 1+8   is Dec 129 is 10000001
 │││││└── Preference 3  2^2   4    | Pref 3,4+6 is Dec  44 is 00101100
 ││││└─── Preference 4  2^3   8    | all Prefs  is Dec 255 is 11111111
 │││└──── Preference 5  2^4  16    |
 ││└───── Preference 6  2^5  32    | etc ...
 │└────── Preference 7  2^6  64    |
 └─────── Preference 8  2^7 128    |

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