Turning multidimensional array into one-dimensional array
PhpArraysMultidimensional ArrayPhp Problem Overview
I've been banging my head on this one for a while now.
I have this multidimensional array:
Array
(
[0] => Array
(
[0] => foo
[1] => bar
[2] => hello
)
[1] => Array
(
[0] => world
[1] => love
)
[2] => Array
(
[0] => stack
[1] => overflow
[2] => yep
[3] => man
)
And I need to get this:
Array
(
[0] => foo
[1] => bar
[2] => hello
[3] => world
[4] => love
[5] => stack
[6] => overflow
[7] => yep
[8] => man
)
Any ideas?
All other solutions I found solve multidimensional arrays with different keys. My arrays use simple numeric keys only.
Php Solutions
Solution 1 - Php
array_reduce($array, 'array_merge', array())
Example:
$a = array(array(1, 2, 3), array(4, 5, 6));
$result = array_reduce($a, 'array_merge', array());
Result:
array[1, 2, 3, 4, 5, 6];
Solution 2 - Php
The PHP array_mergeDocs function can flatten your array:
$flat = call_user_func_array('array_merge', $array);
In case the original array has a higher depth than 2 levels, the SPL in PHP has a RecursiveArrayIterator you can use to flatten it:
$flat = iterator_to_array(new RecursiveIteratorIterator(new RecursiveArrayIterator($array)), 0);
See as well: How to Flatten a Multidimensional Array?.
Solution 3 - Php
As of PHP 5.6 this can be done more simply with argument unpacking.
$flat = array_merge(...$array);
Solution 4 - Php
This is really all there is to it:
foreach($array as $subArray){
foreach($subArray as $val){
$newArray[] = $val;
}
}
Solution 5 - Php
foreach ($a as $v1) {
foreach ($v1 as $v2) {
echo "$v2\n";
}
}
where $a is your array name. for details
Solution 6 - Php
As of PHP 5.3 the shortest solution seems to be array_walk_recursive() with the new closures syntax:
function flatten(array $array) {
$return = array();
array_walk_recursive($array, function($a) use (&$return) { $return[] = $a; });
return $return;
}
Solution 7 - Php
In PHP5.6 there other way to solve this problem, combining the functions, array_shift() to remove the first elemente of the original array, array_pus() to add items an new array, the important thing is the of ... splapt/elipse operator it will unpack the return of array_shitf() like an argument.
<?php
$arr = [
['foo', 'bar', 'hello'],
['world', 'love'],
['stack', 'overflow', 'yep', 'man', 'wow']
];
$new = [];
while($item = array_shift($arr)){
array_push($new, ...$item);
}
print_r($new);
Output:
Array
(
[0] => foo
[1] => bar
[2] => hello
[3] => world
[4] => love
[5] => stack
[6] => overflow
[7] => yep
[8] => man
[9] => wow
)
Solution 8 - Php
I had used this code to resolve same type of problem. so you can also try this.
function array_flatten($array) {
if (!is_array($array))
{
return FALSE;
}
$result = array();
foreach ($array as $key => $value)
{
if (is_array($value))
{
$result = array_merge($result, array_flatten($value));
}
else {
$result[$key] = $value;
}
}
return $result;
}
Solution 9 - Php
This will make
array_walk_recursive($array, function($a) use (&$return) { $return[] = $a; });
Solution 10 - Php
$blocked_dates = array(
'2014' => Array
(
'8' => Array
(
'3' => '1',
'4' => '1',
'6' => '1',
'10' => '1',
'15' => '1',
'25' => '1'
)
),
'2015' => Array
(
'9' => Array
(
'3' => '1',
'4' => '1',
'6' => '1',
'10' => '1',
'15' => '1',
'25' => '1'
)
)
);
RESUTL(ONE DIMENTIONAL ARRAY) :
$unavailable_dates = array();
foreach ($blocked_dates as $year=>$months) {
foreach ($months as $month => $days) {
foreach ($days as $day => $value) {
array_push($unavailable_dates,"$year-$month-$day");
}
}
}
$unavailable_dates = json_encode($unavailable_dates);
print_r($unavailable_dates);
OUTPUT : ["2014-8-3","2014-8-4","2014-8-6","2014-8-10","2014-8-15","2014-8-25","2015-9-3","2015-9-4","2015-9-6","2015-9-10","2015-9-15","2015-9-25"]
Solution 11 - Php
The quickest solution would be to use this array library:
$flattened = Arr::flatten($yourArray);
which will produce exactly the array you want