Dynamic variable names
from the Artful MySQL Tips List
PHP offers a simple trick for data-driven code, supporting runtime naming of variables: Given ...
$varname = 'firstname';
... then prepending an extra dollar sign to the variable name ...
$$varname = 'julie';
... creates a variable by that name and assigns the indicated value to it. Then ...
echo $varname, " is ", $$varname, " i.e, ", $firstname;
firstname is julie i.e, julie
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