Created
April 25, 2019 13:44
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| <?php | |
| $keys = array_reduce( $array, function( $carry, $inner_array ) { | |
| if ( is_array( $inner_array ) ) { | |
| return array_merge( $carry, array_keys( $inner_array ) ); | |
| } | |
| return $carry; | |
| }, [] ); |
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