Zend_Db fetchAll() to return values as keys, not as key => value - zend-db

Question

Is there a way to change the default functionality in Zend_Db fetchall() method, so that it doesn't return this:
[0] => 100000055944231
[1] => 100000089064543
[2] => 100000145893011
[3] => 100000160760965
but this:
[100000055944231]
[100000089064543]
[100000145893011]
[100000160760965]

Answer 1

Although your question is actually flawed (noted by BartekR), I suppose you're trying to receive a simple array, instead of a multidimensional one.
You could do:
$results = $this->db->fetchAll($select);
$values = array_map(function($row) { return $row['column']; }, $results);
This will turn:
array(
array('column' => 'test'),
array('column' => 'test2'),
array('column' => 'test3'),
);
into
array(
'test',
'test2',
'test3'
);
(note; my example only works in PHP5.3+, if you're working with PHP5.2, you can define the function and use it by its name with array_map (e.g. array_map('methodName', $results))

Answer 2

I'm looking for a similar solution, I'm trying to load a field returned by the fetchAll($select) as the array key.. Without looping through the entire resultset.
So:
$results = $this->db->fetchAll($select, <FIELDNAME_TO_MAKE_KEY_OF_RESULTS_ARRAY>);
results[<my fieldname>]->dbfield2;

Answer 3

Further to Pieter's, I'd add the case where the rows are themselves arrays, and not just scalars; it's possible to nest the results, to as many fields as the query contains.
e.g. Here with two levels of nesting, respectively on field1 and field2.
$complex_results = array_map(function($row) { return array($row['field1'] => array($row['field2'] => $row)); }, $results);
As always, each row contains all fields, but $complex_results is indexed by field1, then field2 only.