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<?php function attr_key_add_start_space( array &$array ) : array { foreach ( $array as $key => &$item ) { if ( $key === 'attr' ) { $item = trim( $item ); $item = ' '.$item; } if ( is_array( $item ) ) { attr_key_add_start_space( $item ); } } return $array; } $array = [ 'foo' => 'bar', 'attr' => 'baz', [ 'a' => 'b', 'attr' => 'biz' ], ]; attr_key_add_start_space( $array ); var_dump( $array ); //
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