PHP Array trim blank index values

Question

How to trim a PHP array and remove all empty indexes

Array
(
    [0] => 
    [1] =>
    [2] =>
    [3] =>
    [4] =>
    [5] =>
    [6] =>
    [7] => 4
    [8] => 6
    [9] =>

)

Output should be like

 Array
    (
        [0] => 4
        [1] => 6   
    )

Answer 1

You are looking for the array_filter function ;-)

For instance, this portion of code :

$arr = array(null, 0, null, 0, '', null, '', 4, 6, '', );
$arr_filtered = array_filter($arr);
var_dump($arr_filtered);

Will give you the following output :

array
  7 => int 4
  8 => int 6

Note that all "falsy" values have been removed.

And if you want to be more specific, you can specify your own filtering function. For instance, to remove only nulls from the array, I could use this :

function my_filter($item) {
    if ($item === null) {
        return false;
    }
    return true;
}

$arr = array(null, 0, null, 0, '', null, '', 4, 6, '', );
$arr_filtered = array_filter($arr, 'my_filter');
var_dump($arr_filtered);

And I'd get :

array
  1 => int 0
  3 => int 0
  4 => string '' (length=0)
  6 => string '' (length=0)
  7 => int 4
  8 => int 6
  9 => string '' (length=0)

Answer 2

Sounds like homework to me.

I'd suggest you take a look at the array_filter function. That seems to be the most appropriate option.

Answer 3

Here another way:

<?php

$array = array(
    0 => 0,
    1 => ,
    2 => '',
    3 => 4,
    4 => 6,
    5 => null
);

foreach( $array as $a )
{
    if( !empty($a) AND $a != NULL AND $a != 0 ) // NULL, 0
    {
        $new_array[] = $a;
    }
}

print_r( $new_array );

?>

Output will be:

Array
(
    [0] => 4
    [1] => 6
)