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<?php $array = array ( 0 => array ( ) , 1 => array ( 'wpcf-fields-checkboxes-option-1a38bb558a59802a54ebd4b27c91431e-1' => Array ( 0 => 'Attacco rapido' ) , 'wpcf-fields-checkboxes-option-0ad0b877a16a24fc4958374f171ef112-1' => Array ( 0 => 'Bordo bianco' ) ) , 2 => array ( 'wpcf-fields-checkboxes-option-1a38bb558a59802a54ebd4b27c91431e-1' => Array ( 0 => 'Attacco rapido' ) , 'wpcf-fields-checkboxes-option-3b2241533b2c56891d3fd57718409b85-1' => Array ( 0 => 'Supporti regolabili' ) ) ); array_walk_recursive($array, function ($value, $key) use (&$list) { $list[] = $value; }); print_r($list);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Attacco rapido [1] => Bordo bianco [2] => Attacco rapido [3] => Supporti regolabili )

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