Can I define a class constant inside the class constructor function ?
(based on certain conditions)
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Can I define a class constant inside the class constructor function ?
(based on certain conditions)
That goes against the idea of class constants – they should not be dependent on a specific instance. You should use a variable instead.
However, if you insist on doing this, are very adventurous and can install PHP extensions, you can have a look at the runkit extension that allows to modify classes and their constants at runtime. See this doc: http://www.php.net/manual/en/function.runkit-constant-add.php