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<?php $show = array( 'mon' => false, 'tue' => false, 'wed' => false, 'thu' => false, 'fri' => false, 'sat' => false, 'sun' => false ); array_walk($show, function($x, $i) use ($post) { $x = true; // in your case $x = isset($post[$i]); }); var_dump($show);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $post in /in/kVUu5 on line 13 array(7) { ["mon"]=> bool(false) ["tue"]=> bool(false) ["wed"]=> bool(false) ["thu"]=> bool(false) ["fri"]=> bool(false) ["sat"]=> bool(false) ["sun"]=> bool(false) }

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