Класс SQLite3Result

Since SQLite3Result::numRows is unavailable, use:
<?php
if ($res->numColumns() && $res->columnType(0) != SQLITE3_NULL) {
 // have rows
} else {
 // zero rows
}
?>

Because when there are zero rows:
* SQLite3Result::fetchArray will return '1'
* SQLite3Result::numColumns will return '1'
* Column type for column '0' will be SQLITE3_NULL

According to http://www.php.net/manual/en/sqlite3result.columntype.php, and also per my experience, columnType() doesn't return anything other than SQLITE3_NULL. Consequently, the test suggested in the comment that tries to identify whether a column is NULL is incorrect.
The right thing to do appears to be to test if ($result->fetchArray())[0] == null.

I use the following code to get num_rows:
<?php
...
$nrows = 0;
$result->reset();
while ($result->fetchArray())
 $nrows++;
$result->reset();
return $nrows;
...
?>

in response to jan at bootfinder dot co dot uk (comment #115891) about getting num_rows...
how about (not tested)... ?
<?php // do cleans before and after if needed
for ( $nrows = 0; isarray($result->fetchArray()); ++$nrows );
return $nrows;
?>

Here's a snippet that might help you to write a fetchObject function that is also missing:
<?php
function fetchObject($sqlite3result, $objectType = NULL) {
 $array = $sqlite3result->fetchArray();
 if(is_null($objectType)) {
 $object = new stdClass();
 } else {
 // does not call this class' constructor
 $object = unserialize(sprintf('O:%d:"%s":0:{}', strlen($objectType), $objectType));
 }
 
 $reflector = new ReflectionObject($object);
 for($i = 0; $i < $sqlite3result->numColumns(); $i++) {
 $name = $sqlite3result->columnName($i);
 $value = $array[$name];
 
 try {
 $attribute = $reflector->getProperty($name);
 
 $attribute->setAccessible(TRUE);
 $attribute->setValue($object, $value);
 } catch (ReflectionException $e) {
 $object->$name = $value;
 }
 }
 
 return $object;
}
?>

Heavily inspired of Bergmann's Object Freezer :
https://github.com/sebastianbergmann/php-object-freezer/blob/master/Object/Freezer.php