Multi Dimensional Array resizing in php - php

Question

I have a multi-dimensional array and what i want is in each second degree of array values limit should be set to 4 only. Like i have a array of type:
Array
(
[test2] => Array
(
[0] => Array
(
[application_id] => 405275016
)
[1] => Array
(
[application_id] => 405275016
)
[2] => Array
(
[application_id] => 303198288
)
[3] => Array
(
[application_id] => 303841592
)
)
[test3] => Array
(
[0] => Array
(
[application_id] => 289267216
)
[1] => Array
(
[application_id] => 303198216
)
[2] => Array
(
[application_id] => 405275016
)
[3] => Array
(
[application_id] => 303198288
)
[4] => Array
(
[application_id] => 303841592
)
[5] => Array
(
[application_id] => 311430400
)
[6] => Array
(
[application_id] => 318096216
)
[7] => Array
(
[application_id] => 320256352
)
)
)
and what i want that if the inner arrays value exceed 5 count it should not add any further values to it. i have to format this above array to something like:
Array
(
[test2] => Array
(
[0] => Array
(
[application_id] => 405275016
)
[1] => Array
(
[application_id] => 405275016
)
[2] => Array
(
[application_id] => 303198288
)
[3] => Array
(
[application_id] => 303841592
)
)
[test3] => Array
(
[0] => Array
(
[application_id] => 289267216
)
[1] => Array
(
[application_id] => 303198216
)
[2] => Array
(
[application_id] => 405275016
)
[3] => Array
(
[application_id] => 303198288
)
[4] => Array
(
[application_id] => 303841592
)
)
)
here in second array array last 3 arrays were truncated in order to take only 5 count as a value. I have tried many a methods but none achieved this.
Any idea on how can i achieve this will be highly appreciated ??

Answer 1

or you can use the array_slice function like this:
foreach ($array as $key=>$value)
{
$array[$key] = array_slice($value, 0, 5);
}

Answer 2

$array = array_map(function ($arr) { return array_slice($arr, 0, 5); }, $array);
Note that this uses PHP 5.3+ syntax.
If you actually want an array (or something like it) that cannot hold more than 5 elements, you'll need to implement a custom class (possibly by extending ArrayObject) and/or play around with SplFixedArray.

Answer 3

foreach ($array as $k => $v) { // Loop outer array
for ($i = 5; isset($array[$k][$i]); $i++) { // Loop inner array, starting at element #5
unset($array[$k][$i]); // unset all elements >=5
}
}

Answer 4

PHP has no ready functionality for this behavior, you'll have to make your own function for adding values to the array to achieve this.
Ex:
function array_add_value($array, $value) {
if(count($array) < 5) {
$array[] = $value;
}
}
If you wish to manipulate an existing array that already has too many elements, you will have to make a similar function for that
Ex:
function fix_array($array) {
if(count($array) > 5) {
for($i=4;$i<count($array);$i++) {
unset($array[$i]);
}
}
}