How do I trim '\n' in multi dimensional array in php - php

Question

Output of var_dump($arr)
array(4) {
[0]=>
array(4) {
[0]=>
string(1) "1"
[1]=>
string(1) "2"
[2]=>
string(1) "3"
[3]=>
string(2) "4
"
}
[1]=>
array(4) {
[0]=>
string(1) "5"
[1]=>
string(1) "6"
[2]=>
string(1) "7"
[3]=>
string(2) "8
"
}
[2]=>
array(4) {
[0]=>
string(1) "9"
[1]=>
string(2) "10"
[2]=>
string(2) "11"
[3]=>
string(3) "12
"
}
[3]=>
array(4) {
[0]=>
string(2) "13"
[1]=>
string(2) "14"
[2]=>
string(2) "15"
[3]=>
string(2) "16"
}
}
i Want to remove \n in $arr array.
I tried to use array_walk($arr,'intval'); but it did not work, because it is multiple dimensional array. What's the solution?
Is there any inbuilt PHP function? Or I need to use loops and remove it?
P.S: I am a newbie, try not to get too technical.

Answer 1

You can just do
array_walk_recursive($arr, function(&$v) { $v = trim($v); });
You cannot use trim directly as the callback, because it doesn't accept arguments by reference, so you have to wrap it in a callback that does.
Demo https://eval.in/904410

Answer 2

You can achieve this via loop and array_map()
$arr = array(
array("1", "2", "3", "4\n"),
array("5", "6", "7", "8\n"),
array("9", "10", "11", "12\n"),
array("13", "14", "15", "16\n"),
);
// result array
$result = [];
// Loop thru array
foreach ($arr as $value) {
// Map thru $value with trim to remove \n then push to result
$result[] = array_map('trim', $value);
}
// Output
echo('<pre>');
print_r($result);

Answer 3

There are alternatives, but recursively looping through your array gives you flexibility about what to remove, not only newlines:
function removeNewline($array) {
$result = array();
foreach ($array as $key => $value) {
// If the array value is an array itself, call the function recursively
if (is_array($value)) {
$result[$key] = removeNewline($value);
} else {
// Only remove newlines from strings
if (is_string($value)) {
$result[$key] = preg_replace('/\s+/', '', $value);
} else {
$result[$key] = $value;
}
}
return $result;
}