RE: determine which string is longer and then what is different in that string

["Sanjeev N" <snsanju@xxxxxxxxx>]

Hi Richard,

I am trying to get your actual problem.
First, you want to compare 2 strings and want to check what the difference
between these 2 strings is. I assuming string may contain either numbers or
any characters.

Second, you are trying to compare the numbers.

But I am thinking that your problem is first case.
Then first you check the length, and then check character by character
(check each position, if different character at same position means changed)
for each string.

Warm Regards,
Sanjeev
http://www.sanchanworld.com/
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-----Original Message-----
From: Richard Kurth [mailto:richardkurth@xxxxxxxxxxxxxx] 
Sent: Sunday, August 26, 2007 11:41 AM
To: php-general@xxxxxxxxxxxxx
Subject:  determine which string is longer and then what is different
in that string

I am trying to find out which string is the longest and then find out what
is different between the two string. Sometimes String 2 is longer than
String 1 The script below works sometimes but not all the time.
Is there a better way to do this or tell me what is wrong with the script I
am using
 
$string1 = "1,2,3,4,5,6,7,8";
$string2 = "1,2,3,4,6,7,8"; 
 
 
 
function compare_by_length ($a, $b)
{
    $la = strlen ($a);
    $lb = strlen ($b);
    if ($la == $lb) return (0);
    return ($a > $b) ? 1 : 2;
}
 
$string1 = "1,2,3,4,5,6,7,8";
$string2 = "1,2,3,4,6,7,8"; 
 
$longstring=compare_by_length ($string1, $string2);
 
if ($longstring=="0"){
  echo "nochange" . $longstring;
  echo"<br>";
}
if ($longstring=="1"){
  echo "List " . $longstring;
  echo"<br>";
  $array1 = explode(",", $string1);
  $array2 = explode(",", $string2);
}
if ($longstring=="2"){
  echo "List " . $longstring;
  echo"<br>";
  $array1 = explode(",", $string2);
  $array2 = explode(",", $string1);
 
}
 
   for ($i = 0; $i < count($array1); $i++) {
      $associative_array[$array1[$i]] = 1;
   }
   
   // print "Not a member of the following lists:<br>\n";
   for ($i = 0; $i < count($array2); $i++) {
      if (!$associative_array[$array2[$i]]) {
         print "$array2[$i]<br>\n";
      }
   }

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