Description:
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When inserting multiple rows to SQLite3 using a prepared statement, if you don't bind a parameter for a row then the value from the previous row will be inserted, even if you "clear" and "reset" the statement between lines.

The equivalent code in C seems to work as expected as demonstrated here:
http://stackoverflow.com/questions/32917795/clearing-bindings-on-an-sqlite3-statement-doesnt-seem-to-work-php/32918127

Therefore this leads me to believe this is a PHP bug.

Test script:
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$db = new SQLite3('dogsDb.sqlite');

$db->exec("CREATE TABLE Dogs (Id INTEGER PRIMARY KEY, Breed TEXT, Name TEXT, Age INTEGER)");    

$sth = $db->prepare("INSERT INTO Dogs (Breed, Name, Age)  VALUES (:breed,:name,:age)");

$sth->bindValue(':breed', 'canis', SQLITE3_TEXT);
$sth->bindValue(':name', 'jack', SQLITE3_TEXT);
$sth->bindValue(':age', 7, SQLITE3_INTEGER);
$sth->execute();

$sth->clear(); //this is supposed to clear bindings!
$sth->reset();

$sth->bindValue(':breed', 'russel', SQLITE3_TEXT);         
$sth->bindValue(':age', 3, SQLITE3_INTEGER);
$sth->execute();

Expected result:
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Second database row should have a null value for the 'name' column.

Actual result:
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Second database row has 'jack' value for the 'name' column.