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Hi guys

 

I have a new challenge.

 

Short intro. I am from Holland. In Holland we have a car license plating system that links a license plate to a car. And looking up a license plate, can show the known data of that car (technical info, not personal)

 

There are a bunch of sites where you can get the data for one car at the same time. I am thinking to build a site where I can draw information for a whole range of license plate numbers at once.

 

I don't know if I should create an array or another means to create the range.

 

Example

 

at one time, the numbering on our license plates was: 2 digits - 2 letters - 2 digits (99-xx-99)

 

I wrote a script already that can set the begin and end value... but I have no clue how to create an array with all possible combinations between begin and end value.

 

the code I am using to create the begin and end value for the range is as follows:

 

as part of index.php:

 

  $letter = array (1 => 'D', 'F', 'G', 'H', 'J', 'K', 'L', 'N', 'P', 'R', 'S', 'T', 'X', 'Y', 'Z');
  $number = range (0, 9);
 

  echo '<form action="select.php" method="post">';
   
  // create select for range 1
  echo '<p>Set range 1';
  echo '<select name="letter11">';
  foreach ($letter as $key => $value) {
   echo "<option value=\"$value\"> $value</option>\n";
  }
  echo '</select>'; 

  echo '<select name="letter12">';
  foreach ($letter as $key => $value) {
   echo "<option value=\"$value\"> $value</option>\n";
  }
  echo '</select>';
 
  echo '<select name="digit11">';
  for ($number = 0; $number <= 9; $number++) { 
   echo "<option value=\"$number\"> $number</option>\n";
  }
  echo '</select>';
 
  echo '<select name="digit12">';
  for ($number = 0; $number <= 9; $number++) { 
  echo "<option value=\"$number\"> $number</option>\n";
  }
  echo '</select>';
  
  echo '<select name="letter13">';
  foreach ($letter as $key => $value) {
   echo "<option value=\"$value\"> $value</option>\n";
  }
  echo '</select>'; 

  echo '<select name="letter14">';
  foreach ($letter as $key => $value) {
   echo "<option value=\"$value\"> $value</option>\n";
  }
  echo '</select></p>';
 // create select for range 2
  echo '<p>Set range 2';
    echo '<select name="letter21">';
  foreach ($letter as $key => $value) {
   echo "<option value=\"$value\"> $value</option>\n";
  }
  echo '</select>'; 

  echo '<select name="letter22">';
  foreach ($letter as $key => $value) {
   echo "<option value=\"$value\"> $value</option>\n";
  }
  echo '</select>';
 
  echo '<select name="digit21">';
  for ($number = 0; $number <= 9; $number++) { 
   echo "<option value=\"$number\"> $number</option>\n";
  }
  echo '</select>';
 
  echo '<select name="digit22">';
  for ($number = 0; $number <= 9; $number++) { 
  echo "<option value=\"$number\"> $number</option>\n";
  }
  echo '</select>';
  
  echo '<select name="letter23">';
  foreach ($letter as $key => $value) {
   echo "<option value=\"$value\"> $value</option>\n";
  }
  echo '</select>'; 

  echo '<select name="letter24">';
  foreach ($letter as $key => $value) {
   echo "<option value=\"$value\"> $value</option>\n";
  }
  echo '</select></p>';
  echo '<input type="hidden" name="sc" value="sc4">';
  echo '<input name="submit" type="submit" value="Create List"';
 }

 

 

After pressing the submit, it will send all data to select.php

 

for now I simply plot the beginning and end in it as follows:

$letterrange11 = ($_POST ['letter11']).($_POST ['letter12']);
  $digitrange11 = ($_POST ['digit11']).($_POST ['digit12']);
  $letterrange12 = ($_POST ['letter13']).($_POST ['letter14']);
 
  $letterrange21 = ($_POST ['letter21']).($_POST ['letter22']);
  $digitrange21 = ($_POST ['digit21']).($_POST ['digit22']);
  $letterrange22 = ($_POST ['letter23']).($_POST ['letter24']);
  
  echo '<p>'.$letterrange11.'-'.$digitrange11.'-'.$letterrange12.' until '.$letterrange21.'-'.$digitrange21.'-'.$letterrange22.'</p>';

 

 

So the big question is now... The code I used til now, is it a good basis to create the array that I need? If so, How do I build an array that will look like as follows...

 

What I need is if I select DD-00-DD to DZ-99-ZZ, to plot all possible values in an array. This based on the $letter array.

e.g.

DD-00-DD

DD-01-DD

DD-02-DD

etc, etc, etc,

DZ-99-ZV

DZ-99-ZX

DZ-99-ZZ

 

This data I can then send per license plate to the to-be-built script.

 

 

I realize it is a huge list, but I am curious how this could work out.

 

Any help is welcome.

 

THANKS GUYS!

Regards

Mike

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I wouldn't recommend doing things the way you're doing it now, but before I can help you, I need to better understand how the system works. For example, if I specify the following range:

 

AA-00-AA to AA-00-AG

 

Then I would want to find all of the following license plates, right?

 

AA-00-AA

AA-00-AB

AA-00-AC

AA-00-AD

AA-00-AE

AA-00-AF

AA-00-AG

 

Likewise, if I searched for AA-00-AA to AA-02-BD, then I'd need all 676 (26 * 26) licence plates that start with AA-00, all 676 license plates that start with AA-01 and all the AA-02 license plates up to AA-02-BD, right?

 

Please let me know if me logic is correct or not. Thank you.

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Hey HartleySan

 

Thank you so much for looking with me

 

Yes, more or less

 

Except we're limited to these letters:

  $letter = array (1 => 'D', 'F', 'G', 'H', 'J', 'K', 'L', 'N', 'P', 'R', 'S', 'T', 'X', 'Y', 'Z');

 

All others are not necessary. All digits are possible.

 

This is just one of the many series of possible combinations

Example... currently we are at 1 digit - three letters - 2 digits (9-xxx-99). So I was trying to create a script that I can easily apply to all kinds of possible (and future) ranges

 

Thanks

Mike

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Hmmm... first off, I wouldn't bother with searching for license plates of the format AA-00-AA until such a system actually exists. In other words, I would stick with the 0-AAA-00 format until a new format starts being used.

 

Secondly, is there any particular reason why you are starting the index of the letters array at 1 and not 0?

 

Thirdly, I can see why all the other sites only let you search one license plate at a time. With the (seemingly) random letters being used and huge number of possibilities with even a "small" range, your queries strings could be quite long and queries could be quite time-consuming.

 

Fourthly, do you have legit access to the DB that you're planning on querying?

 

Assuming all of the things I just mentioned are okay, I have a few additional thoughts:

 

1) For the license plate input range, I would simply provide two text inputs, and then have users input a range such as the following:

2-DLN-98     2-DLP-53

 

You can then use a regex on the user input to both validate and process the input.

 

2) I can't think of an easy way to perform the queries. You're either going to have to perform a bunch of queries (for which, I definitely recommend prepared statements), or you're going to have to build up a huge query string in PHP (which would perhaps exceed the MySQL limit, if there is one). Either way, your queries seem like they will be very inefficient, but I can't think of a better way to do this. Perhaps someone else on the forums has a better idea.

 

3) Related to #2, I would greatly limit people's queries to a range of 100 license plates or less. I think that's more than reasonable, don't you?

 

Anyway, please give me your thoughts, and we can go from there.

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Hello HartleySan

 

I will add some answers and comments to yours

 

1. These are the (existing) systems I want to make inquiries in:

Sidecode 4 (XX-99-XX)
Sidecode 5 (XX-XX-99)
Sidecode 6 (99-XX-XX)
Sidecode 7 (99-XXX-9)
Sidecode 8 (9-XXX-99)

Hence the flexibility I am searching for in creating the begin and end point.

 

2. No, no reason, it is an adjusted array of one of Larry's scripts

 

3. That's why I want to be the first

 

4. Yes I have legit access, but these things are all besides the point. I have java scripts available, but first things first.

 

as answers to your ) - numbered remarks;

 

1) I want to exclude non-existing combinations, by providing a fixed selection (hence the letter array)

 

2) and 3) Good idea to limit it.

 

So remains... how can I build this array?

 

 

Any ideas how to start this?

 

Thanks again

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Okay. Here is my response:

 

Are all the differently formatted license plate numbers mixed together in the same table? If so, are there any other columns in the table to check for only a certain format (e.g., XX-99-XX)? In other words, what's the structure of the DBs/tables that you're dealing with?

 

As I said before, I would allow the user to input a string into a text field (or two text fields for a range), upon which you should use regexes and whatnot to both parse and validate the input. Once you have confirmed that the input is legit, then I would make the DB request(s).

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