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<?php unset($_POST); var_dump(filter_var( $a, FILTER_NULL_ON_FAILURE));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $a in /in/XcMXW on line 3 Warning: filter_var(): Unknown filter with ID 134217728 in /in/XcMXW on line 3 bool(false)

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