I need to get two arrays to merge into one while keeping all the keys in place and listing the values in an array like in this example:
$array1 = array('car' => '3', 'bus' => '2');
$array2 = array('dog' => '1', 'car' => '2', 'bird' => '9');
$merged = array(
'car' => array('3','2'),
'bus' => array('2',null),
'dog' => array(null,'1'),
'bird' => (null,'9')
);
array_merge() appends the values of the second array to the first. It does not overwrite keys.
Your example, results in:
Array ( [0] => foo [1] => bar [2] => bar [3] => foo )
However, If the input arrays have the same string keys, then the later value for that key will overwrite the previous one. If, however, the arrays contain numeric keys, the later value will not overwrite the original value, but will be appended.
Unless this was just an example to another problem you were having?
Try with array_merge_recursive
$A = array('a' => 1, 'b' => 2, 'c' => 3);
$B = array('c' => 4, 'd'=> 5);
$c = array_merge_recursive($A,$B);
echo "<pre>";
print_r($c);
echo "</pre>";
will return
Array
(
[a] => 1
[b] => 2
[c] => Array
(
[0] => 3
[1] => 4
)
[d] => 5
)
You can iterate over your array with a help of a stack to build your toc.
$stack = &$array;
$separator = '.';
$toc = array();
while ($stack) {
list($key, $value) = each($stack);
unset($stack[$key]);
if (is_array($value)) {
$build = array($key => ''); # numbering without a title.
foreach ($value as $subKey => $node)
$build[$key . $separator . $subKey] = $node;
$stack = $build + $stack;
continue;
}
$toc[$key] = $key. ' ' . $value;
}
print_r($toc);
Output:
Array
(
[1] => 1
[1.5] => 1.5
[1.5.3] => 1.5.3 testvalue1
[2] => 2
[2.6] => 2.6 testvalue2
[3] => 3 testvalue3
[4] => 4 testvalue4
)
You can additionally handle the level as well if you need to, but that was not clear from your question.
array_walk_recursive does not work, because it won't give you the keys of the parent element(s). See this related question as well: Transparently flatten an array, it has a good answer and is helpful for more generic cases as well.
If both arrays are in the same order, the code is pretty straightforward:
$a = array(
array('5/2/2013', '9:31:00 AM', '0.395', '0.395', '302.855', '0.563'),
array('5/2/2013', '9:33:00 AM', '0.383', '0.383', '303.431', '0.563'),
);
$b = array(
array('5/2/2013', '9:31:00 AM', '-1.000', '-1.000', '-1.000', '-1.670', '-1.000', '-11.000'),
array('5/2/2013', '9:33:00 AM', '-1.000', '-1.000', '-1.000', '-1.670', '-1.000', '-11.000'),
);
$i = new MultipleIterator(MultipleIterator::MIT_NEED_ALL | MultipleIterator::MIT_KEYS_ASSOC);
$i->attachIterator(new ArrayIterator($a), 'a');
$i->attachIterator(new ArrayIterator($b), 'b');
$result = [];
foreach ($i as $v) {
$result[] = array_merge($v['a'], array_slice($v['b'], 2));
}
print_r($result);
You basically iterate over both arrays at the same time and for each element construct the final array by merging the first with the second (skipping the common part).
Result:
Array
(
[0] => Array
(
[0] => 5/2/2013
[1] => 9:31:00 AM
[2] => 0.395
[3] => 0.395
[4] => 302.855
[5] => 0.563
[6] => -1.000
[7] => -1.000
[8] => -1.000
[9] => -1.670
[10] => -1.000
[11] => -11.000
)
[1] => Array
(
[0] => 5/2/2013
[1] => 9:33:00 AM
[2] => 0.383
[3] => 0.383
[4] => 303.431
[5] => 0.563
[6] => -1.000
[7] => -1.000
[8] => -1.000
[9] => -1.670
[10] => -1.000
[11] => -11.000
)
)
Usage:
PS. It can work with more than two arrays, just pass as many as you want as next arguments.