Barcode Check digit calculation formula PHP, T-SQL program _php Tutorial

Recent work involves the calculation of barcode 13th bit Check bit batch change, AI, barcode printer, barcode scanner and other software built-in check bit, online search also found bar code generator, but for us is not flexible enough to write a small program calculation check bit

OK First look at the PHP version, and online search to a lot simpler

function En13 ($code)
{
$tmp 1=0;
$tmp 2=0;
for ($i =0; $i <12; $i + +)
{
if ($i% 2==0)
$tmp 1+=substr ($code, $i, 1);
Else
$tmp 2+=substr ($code, $i, 1);
}
Return (10-($tmp 2*3+ $tmp 1)%10)%10;
}

Test www.2cto.com
$t = "6939762911740";
echo En13 ($t);
function En13 ($code)
{
$tmp 1=0;
$tmp 2=0;
for ($i =0; $i <12; $i + +)
{
if ($i% 2==0)
$tmp 1+=substr ($code, $i, 1);
Else
$tmp 2+=substr ($code, $i, 1);
}
Return (10-($tmp 2*3+ $tmp 1)%10)%10;
}

Test
$t = "6939762911740";
echo En13 ($t);
Also have to the MSSQL database data in batch update do not write programs directly in SQL Enterprise Manager update

T-SQL code

DECLARE @str as varchar (15)
DECLARE @tmp as varchar (30)
DECLARE @t1 as int
DECLARE @t2 as int
DECLARE @i int
Set @t1 =0
Set @t2 =0
Set @str = ' 6939762911740 '
Set @i=1
While @i<=12
Begin
If @i% 2=0
Begin
Set @t1 = @t1 +substring (@str, @i,1)
End
Else
Begin
Set @t2 = @t2 +substring (@str, @i,1)
End
Set @i=@i+1

End

Set @tmp = (10-(@t1 *3+ @t2)%10)%10

--end function
SELECT @t1, @t2, @tmp
DECLARE @str as varchar (15)
DECLARE @tmp as varchar (30)
DECLARE @t1 as int
DECLARE @t2 as int
DECLARE @i int
Set @t1 =0
Set @t2 =0
Set @str = ' 6939762911740 '
Set @i=1
While @i<=12
Begin
If @i% 2=0
Begin
Set @t1 = @t1 +substring (@str, @i,1)
End
Else
Begin
Set @t2 = @t2 +substring (@str, @i,1)
End
Set @i=@i+1

End

Set @tmp = (10-(@t1 *3+ @t2)%10)%10

--end function
SELECT @t1, @t2, @tmp www.2cto.com
The calculation method of the ENA-13 check code position ordinal code position sequence number refers to including the checksum, the right-to-left sequence numbers (the code position of the check code is ordinal 1). The calculation steps of the verification code are as follows: A. Starting with the code position ordinal 2, the numeric code for all even digits is summed. b. Multiply the sum of steps a by 3. C. Starting with the code position ordinal 3, the numeric code for all odd digits is summed. D. Add step B to the result of step c. E. With the result of greater than or equal to step d and the number of 10 min integer times minus step D results, the difference is the value of the check code to be obtained. Example: The calculation of code 690123456789x1 check code is shown in table 1. Table 1 The method of calculating the verification code example 1. Right-to-left sequential numbering position ordinal 13 12 11 10 9 8 7 6 5 4 3 2 1 Code 6 9 0 1 2 3 4 5 6 7 8 9 X 2. The sum of the numbers on the even digits is calculated from the ordinal 2 ①9+7+ 5+3+1+9=34①3. ①*3=②34x3=102②4. Starting with the ordinal 3, the sum of the numbers on the odd digits is calculated and ③8+6+4+2+0+6=26③5. ②+③=④102+26=128④6. Subtract ④ with a number greater than or equal to the result ④ and 10 minimum integer times, the difference is the value of the check code to be obtained 130-128=2 check code x1=2

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