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When to used static visibility? [duplicate]

I can't attain the primary used of Static Visibility. My question is why they used static method & properties in this code? class PassHash { // blowfish private static $algo = '$2a'; ...
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Use a global variable, a singleton, or something else

Preface: I am working in PHP (Abandon hope all ye who enter here). Background: There exists a large set of global functions in PHP, a number of which are miscellaneous system calls, like sleep (and ...