What is the easiest way to create multi-dimensional array in php dynamically?
Here a static version:
$tab['k1']['k2']['k3'] = 'value';
I would like to avoid eval().
I'm not successful with variable variable ($$)
so I'm trying to develop a function fun with such a signature:
$tab = fun($tab, array('k1', 'k2', 'k3'), 'value');
There are a number of ways to achieve this, but here is one which uses PHP's ability to have N arguments passed to a function. This gives you the flexibility of creating an array with a depth of 3, or 2, or 7 or whatever.
// pass $value as first param -- params 2 - N define the multi array
function MakeMultiArray()
{
$args = func_get_args();
$output = array();
if (count($args) == 1)
$output[] = $args[0]; // just the value
else if (count($args) > 1)
{
$output = $args[0];
// loop the args from the end to the front to make the array
for ($i = count($args)-1; $i >= 1; $i--)
{
$output = array($args[$i] => $output);
}
}
return $output;
}
Here's how it would work:
$array = MakeMultiArray('value', 'k1', 'k2', 'k3');
And will produce this:
Array
(
[k1] => Array
(
[k2] => Array
(
[k3] => value
)
)
)
Following function will work for any number of keys.
function fun($keys, $value) {
// If not keys array found then return false
if (empty($keys)) return false;
// If only one key then
if (count($keys) == 1) {
$result[$keys[0]] = $value;
return $result;
}
// prepare initial array with first key
$result[array_shift($keys)] = '';
// now $keys = ['key2', 'key3']
// get last key of array
$last_key = end($keys);
foreach($keys as $key) {
$val = $key == $last_key ? $value : '';
array_walk_recursive($result, function(&$item, $k) use ($key, $val) {
$item[$key] = $val;
});
}
return $result;
}
This should work if $tab always has 3 indices:
function func(&$name, $indices, $value) { $name[$indices[0]][$indices[1]][$indices[2]] = $value; };
func($tab, array( 'k1', 'k2', 'k3' ), 'value' );
