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<?php $a = array('color.box' => 'red', 'some-var' => 'yes', 'valid' => 'ok'); extract($a); var_dump(${"color.box"}); var_dump(${"some-var"}); var_dump(${"valid"});
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $color.box in /in/rWKTJ on line 6 NULL Warning: Undefined variable $some-var in /in/rWKTJ on line 7 NULL string(2) "ok"

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