Math Php

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  4. Constants, like the names of variables, are case-sensitivebut unlike variables
They do not start with a dollar sign. 
You can change this behavior by passing true as a third parameter to define( ), which makes the constant case-insensitive:
    define("SecondsPerDay", 86400, true);
    print SecondsPerDay;
    print SECONDSperDAY;
?>