Remove empty values from PHP array but keep 0

Both 0 and '' are considered falsey in php, and so would be removed by array filter without a specific callback. The suggestion above to use 'strlen' is also wrong as it also remove an empty string which is not the same as NULL. To remove only NULL values as you asked, you can use a closure as the callback for array_filter() like this:

array_filter($array, function($v) { return !is_null($v); });

You can remove empty value and then re-index the array elements by using array_values() and array_filter() function together as such:

$arr = array("PHP", "HTML", "CSS", "", "JavaScript", null, 0);
print_r(array_values(array_filter($arr)));

Output:

Array
(
    [0] => PHP
    [1] => HTML
    [2] => CSS
    [3] => JavaScript
)

In case your array could contain line feeds and you want to filter them out as well, you may want to trim values first:

$arrayItems = ["\r", "\n", "\r\n", "", " ", "0", "a"];
$newArray = array_values(array_filter(array_map('trim', $arrayItems), 'strlen'));
// Output(newArray): ["0", "a"]

//Another great snippet to remove empty items from array
$newArray = array_filter($arrayItems , function ($item) {
    return !preg_match('/^\\s*$/', $item);
    // filter empty lines
});
// Output(newArray): ["0", "a"]

If you face any issue with implementing the code just comment here below.

function myFilter($var){
  return ($var !== NULL && $var !== FALSE && $var !== '');
}

$res = array_filter($yourArray, 'myFilter');

If you just need the numeric values you can use is_numeric as your callback

Demo

$res = array_filter($values, 'is_numeric');

As of PHP 7.4:

$withoutNulls = array_filter($withNulls, static fn($e) => $e !== null);

Remove null values from array

$array = array("apple", "", 2, null, -5, "orange", 10, false, "");

var_dump($array);

echo "<br>";



// Filtering the array

$result = array_filter($array);                 

var_dump($result);

?>