Inconsistent php sematics witrh trim() ... or can't trim() handle assignment with same variable?

["Svensson, B.A.T. (HKG)" <B.A.T.Svensson@lumc.nl>]

Just ran into this annoying thing today:


Why does this /NOT/ work to remove NL's:

    $AccNr = fgets($fp);
    while ( !feof($fp) ) {

       $AccNr = trim($AccNr);  /// trim() DOES NOT WORK HERE
       $InsertStr = "insert into $UpLoadTable values ('$AccNr')";
       print "<pre>$i: Inserting: $InsertStr </pre>";
       ob_flush();
       mssql_query($InsertStr);

       $AccNr = fgets($fp);
    }

while this works just fine to remove NL's:

    $AccNR = trim( fgets($fp) );  // trim WORKS JUST FINE HERE
    while ( !feof($fp) ) {

       $InsertStr = "insert into $UpLoadTable values ('$AccNr')";
       print "<pre>$i: Inserting: $InsertStr </pre>";
       ob_flush();
       mssql_query($InsertStr);

       $AccNr = trim( fgets($fp) ); // trim WORKS JUST FINE HERE

    }

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