[PHP] Semi-Newbie question about arrays

[Gremillion]

I'm trying to create a multidimensional array of values to update a 
Filemaker db. Edits to existing fields end in numbers (the record  
ID).I'm having a problem, probably obvious to anyone here in setting up 
the multidimensional array:

$updateEntries = array();     //stores existing db entries
$ord = -1;
$recNum = 0;
foreach ($_POST as $key => $value) {
   if ($value != "") {
               $lastPartPos  = strrchr($key, '_');
               $lastPart = substr($lastPartPos, 1);
               if (preg_match("/[0-9]+/" , $lastPart)) {  //if it's an 
existing update
                   $lastpartnum = strrpos($key, '_');
                   $firstnum = substr($key, 0, $lastpartnum);
                   $first = str_replace('_', '.', $firstnum);  
//restore periods to field name and strip off record ID at end
                   if ($lastPart != $recNum) {
                       $recNum = $lastPart;
                       $ord++;
                       $updateEntries[$ord] = $recNum;
                   }
                   $updateEntries[$ord][] = array($first, $value); 
//populate nested arrays of each entry
etc......

throws:
"PHP Fatal error:  [] operator not supported for strings"
How do I make $updateEntries[$ord] evaluate as an array?

Thanks in advance

RG



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