How to unset numeric index elements from a PHP array? - php

Question

I have a collection of array it contains both numeric index as well as non numeric. I want to unset all the numeric indexes.
My array is something like this .
Array
(
[554] => Array
(
[0] => 554
[1] => Jiaqi Zheng
[2] => Female
[3] => 28
[4] => Table Tennis
[5] =>
[6] =>
[7] =>
[8] =>
[rank] => 554
[athlet_name] => Jiaqi Zheng
[gender] => Female
[sport] => Table Tennis
)
[555] => Array
(
[0] => 555
[1] => Zach Ziemek
[2] => Male
[3] => 23
[4] => Athletics
[5] =>
[6] =>
[7] =>
[8] =>
[rank] => 555
[athlet_name] => Zach Ziemek
[gender] => Male
[sport] => Athletics
)
)
Here i have to unset all the numeric index .
I used unset like this and its working fine for me .
unset(
$history_years_wise_country_wise_details_arr[ $history_years_wise_country_wise_details_info[0]][0],
$history_years_wise_country_wise_details_arr[$history_years_wise_country_wise_details_info[0]][1],
$history_years_wise_country_wise_details_arr[$history_years_wise_country_wise_details_info[0]][2],
$history_years_wise_country_wise_details_arr[$history_years_wise_country_wise_details_info[0]][3],
$history_years_wise_country_wise_details_arr[$history_years_wise_country_wise_details_info[0]][4],
$history_years_wise_country_wise_details_arr[$history_years_wise_country_wise_details_info[0]][5],
$history_years_wise_country_wise_details_arr[$history_years_wise_country_wise_details_info[0]][6],
$history_years_wise_country_wise_details_arr[$history_years_wise_country_wise_details_info[0]][7],
$history_years_wise_country_wise_details_arr[$history_years_wise_country_wise_details_info[0]][8]
);
Is there any way I will reduce the lines of codes? here 0 to 8 are in one series.
Can I unset all index in one line of code , as all are numeric?
Is it possible to use regular expression instead?
I want something like
unset(
$history_years_wise_country_wise_details_arr[ $history_years_wise_country_wise_details_info[0]][anything_which_will_take_index_from_0_to_8]);
Any suggestions?
Thank you

Answer 1

You could use array_filter() with is_string() function as its callback function:
$array = array_filter($array, 'is_string', ARRAY_FILTER_USE_KEY);

Answer 2

Use looping.
foreach ($array as $key => $value) {
if (is_numeric ($key)) {
unset($array [$key]);
}
}
Or use array_filter
$filtered = array_filter(
$array,
function ($key) {
return !is_numeric($key);
},
ARRAY_FILTER_USE_KEY
);

Answer 3

You shoud used foreach loop with is_numeric function like
foreach ($your_array as $key => $value) {
if (!is_numeric($key)) {
unset($arr[$key]);
}
}
i think there is no need of any regular expression

Answer 4

Since you have array inside array first you need to use array_map() and then traverse through array using array_filter(),
considering $array as your array:
$resultData = array_map([$this, 'allData'], $array);
public function allData($data)
{
$numericKeys = array_filter(array_keys($data), function ($k) {
return is_int($k);
});
// Updated Code
$arrayKeys = array_diff(array_keys($data),$numericKeys);
return array_intersect_key($data,array_flip($arrayKeys));
}