Remove empty string in array of strings - php

Question

It seems that there are dozens of topic with similar problem, and mostly all have the same answer: use array_filter, array_map. The problem is that I used them, but it didn't quite help. So I have an array (is built from data in csv file):
Array
(
[0] => Array
(
[0] => name
[1] => title
[2] => email
)
[1] => Array
(
[0] => First
[1] => title 1
[2] => email1#ex.com
)
[2] => Array
(
[0] => second
[1] => title 1
[2] => email2#ex.com
)
[3] => Array
(
[0] =>
)
[4] => Array
(
[0] => third
[1] => title 1
[2] => email3#ex.com
)
[5] => Array
(
[0] =>
)
[6] => Array
(
[0] =>
[1] =>
[2] =>
)
)
I have to delete all empty arrays. So I use such code:
while (($row = fgetcsv($file, 8192, ';')) !== false) {
if (array(null) !== $row) { // ignore blank lines
$csv[] = $row;
}
}
$array = array_filter(array_map('array_filter', $csv));
$array now is:
Array
(
[0] => Array
(
[0] => name
[1] => title
[2] => email
)
[1] => Array
(
[0] => First
[1] => title 1
[2] => email1#ex.com
)
[2] => Array
(
[0] => second
[1] => title 1
[2] => email2#ex.com
)
[3] => Array
(
[0] => third
[1] => title 1
[2] => email3#ex.com
)
[4] => Array
(
[1] =>
)
)
Why there is a 4th array with empty value? I need to get rid of it.
gettype($array[4][1]) = string
UPDATE
The csv has empty rows, and even just a ";" delimiter without any string. I cannot influence on the process of inserting data into this csv.
The csv looks like this:
1 row: name;title;email
2 row: First;title 1;email1#ex.com
3 row: second;title 1;email2#ex.com
4 row:
5 row: third;title 1;email3#ex.com
6 row:
7 row: ; ;

Answer 1

and mostly all have the same answer: use array_filter, array_map.
array_filter is a good approach, but I wouldn't use array_map, but array_reduce:
$array = array_filter(
$csv,
function ($value) {
return 0 < array_reduce(
$value,
function ($carry, $item) {
return empty(trim($item)) ? $carry : $carry + 1;
},
0
);
}
);
With array_reduce, I count the non-empty elements in an array. And if there are zero non-empty elements, the array is thrown away with array_filter.
For reference, the PHP 7.4-syntax, which looks nicer in my eyes, but could be a bit confusing at first
$array = array_filter(
$csv,
fn ($val) => 0 < array_reduce(
$val,
fn ($carry, $item) => empty(trim($item)) ? $carry : $carry + 1,
0
)
);