Las constantes solo puede albergar valores escalares, pero utilizando la función eval() puedes resolver el problema de definir una constante con el resultado de una función.
por ejemplo:
eval("define(\"HOY\",\"".date("Y-m-d")."\");");
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Server IP: 69.147.83.197
Probable Submitter: 190.96.162.175
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Manual Page -- http://www.php.net/manual/en/language.constants.php
Edit -- https://master.php.net/note/edit/86071
Del: integrated -- https://master.php.net/note/delete/86071/integrated
Del: useless -- https://master.php.net/note/delete/86071/useless
Del: bad code -- https://master.php.net/note/delete/86071/bad+code
Del: spam -- https://master.php.net/note/delete/86071/spam
Del: non-english -- https://master.php.net/note/delete/86071/non-english
Del: in docs -- https://master.php.net/note/delete/86071/in+docs
Del: other reasons-- https://master.php.net/note/delete/86071
Reject -- https://master.php.net/note/reject/86071
Search -- https://master.php.net/manage/user-notes.php
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