Random avatar color?

Question

Habr

Hello everyone, I'm very interested in the method that Habrahabr uses. Namely, how do they implement the random color of standard avatars for users?
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looked at the source code

<span class="user-pic_default user-pic_default_47 user-pic_blue"></span>

<span class="user-pic_default user-pic_default_47 user-pic_lilac"></span>

Answer 1

$colors = ['blue', 'pink', 'lilac', 'green'];
$color=$colors[ $userId%count($colors) ]

:)