Code Duplication    Length = 5-7 lines in 2 locations

includes/wpinv-invoice-functions.php 2 locations

@@ 2129-2135 (lines=7) @@
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                }
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            }
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            if ( empty( $number ) ) {
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                $increment_number = false;
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                $number = $start;
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                $save_number = ( $number - 1 );
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            } else {
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                $save_number = $number;
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            }
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        }
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    }
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@@ 2139-2143 (lines=5) @@
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        }
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    }
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    if ( $start > $number ) {
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        $increment_number = false;
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        $number = $start;
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        $save_number = ( $number - 1 );
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    }
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    if ( $save_number !== false ) {
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        update_option( 'wpinv_last_invoice_number', $save_number );