[Sync-En] misc: add the namespace caveats to define(), defined() and constant() - #3464
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…constant() Translation of php/doc-en#5256 (commit 5dc2dea): the three pages state that the name is taken as a plain string, is not resolved against the current namespace and ignores use aliases, that define() keeps a leading separator where defined() and constant() strip it, and that separators must be escaped in double-quoted strings. EN-Revision updated.
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Translation of php/doc-en#5256 (commit 5dc2dea): the three pages now state that the constant name is taken as a plain string, is not resolved against the current namespace and ignores
usealiases, thatdefine()keeps a leading separator wheredefined()andconstant()strip it, and that separators must be escaped in double-quoted strings. EN-Revision updated.Fixes: #3455