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print_nodes($data);

...
        }
    }
}

1st node: Text of 1st node
2nd node: Text of 2nd node
subnode A: Text of subnode A
subnode B: Text of subnode B
3rd node: Text of 3rd node

print_nodes( $data, 0 );

...
        }
    }
}

1st node: Text of 1st node
2nd node: Text of 2nd node
    subnode A: Text of subnode A
    subnode B: Text of subnode B
3rd node: Text of 3rd node