Description:
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the use of constructs would be nice.  i don't see a reason why i shouldn't be able to do something like this:

$db_prefix="mysql_";
$conn_func=$db_prefix."connect";

$conn_func('localhost','example','password');

having to build wrapper functions for every construct i want to use within a class bloats the code and makes things less manageable.

Reproduce code:
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From manual page: functions.variable-functions
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