<?php $a = 10; $b = 20; $c = 30; $d = 40; $defined_variables = get_defined_vars(); $defined_variables = get_defined_vars(); $variables2keep = array("a", "b", "c", "variables2keep"); foreach($defined_variables as $variable => $value) if(!in_array($variable, $variables2keep)) unset($$variable); print_r(get_defined_vars());
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