[RESOLVED] Alternative to array_intersect_key?

[ixalmida]

I need this function, but I'm currently working on a PHP 4.3 server and array_intersect_key() isn't supported until version 5.0.

Does anyone know of an alternative function I can use? Or does anyone have some code that will work and not be terribly slow?

Thanks.

[NogDog]

Check out the users' notes on the [man]array_intersect_key/man manual page, and you'll find a few suggestions.

[ixalmida]

Yep, I should have looked there first. Sorry. :o

[ixalmida]

Just for the record (in case someone chances upon this thread in the future), I decided to go with this code:

// The dilemma: get values from 2 different tables, then display a report with
// ALL the data, but also merge the two tables where their indexes match.
// OPTIONALLY display detailed data (not coded here)
// Outer values...
mysql_query("SELECT location FROM Locations", $link);
while($row = mysql_fetch_array)
  {
  $location = $row['location'];
  // Populate array 1...
  mysql_query("SELECT index1, value1 FROM table1 WHERE location = $location", $link);
  while($row = mysql_fetch_array($result))
    {
    $key = $row['index1'];
    $value = $row['value1'];
    $array1[$location][$key] = $value;
    }

  // Populate array 2...
  mysql_query("SELECT index1, value2 FROM table2 WHERE location = $location", $link);
  while($row = mysql_fetch_array($result))
    {
    $key = $row['index1'];
    $value = $row['value2'];
    $array2[$location][$key] = $value;
    }

  // Here's the solution part...
  $keys1 = array_keys($array1[$location]);
  $keys2 = array_keys($array2[$location]);
  $keys_not_in_array1 = array_diff($keys2, $keys1);
  }

// NOTE:  I'm leaving out the 3rd "detail" element of the report here, 
// which is the main reason for using arrays...

// Display the report...
foreach($array1 as $key => $value)
  {
  echo "<table><tr><td colspan='3'><strong>Location: $key</strong></td></tr>";
  // Iterate through $value (which is actually $array1)...
  foreach($value as $key => $value)
    {
    echo "<tr><td>$key</td><td>$value</td>";
    // Display matching indexes from array2, if any...
    if(isset($array2[$key]))
      echo "<td>$array2[$key]</td><tr>";
    else
      echo "<td></td></tr>";
    }
  // Iterate through the remaining un-matched values...
  foreach($keys_not_in_array1 as $key => $value)
    {
    echo "<tr><td>$key</td><td></td><td>$value</td></tr>";
    }
  }