How to remove empty and null values from an array in php? - php

Question

I want to remove the empty and null values from $listValues array.
Here I am removed the empty values using array_filter.
Sample Code:
$listValues = array("one", "two", "null","three","","four","null");
$resultValues = array_filter($listValues);
echo "<pre>";
print_r($resultValues);
echo "</pre>";
Result:
Array ( [0] => one [1] => two [2] => null [3] => three [5] => four [6] => null )
But I want
Array ( [0] => one [1] => two [3] => three [5] => four )
Any advice greatly appreciated.

Answer 1

try this : use array_diff() function compares the values of two (or more) arrays, and returns the differences. to remove null and "" . if you need to remove some more field then add that values inside the array
<?php
$listValues = array("one", "two", "null","three","","four","null");
echo "<pre>";
$a=array_values(array_diff($listValues,array("null","")));
print_r($a);
echo "</pre>";
?>
output :
Array
(
[0] => one
[1] => two
[2] => three
[3] => four
)
refer
http://www.w3schools.com/php/func_array_diff.asp

Answer 2

Try array_filter with second parameter as a user defined function like this:
$listValues = array("one", "two", "null","three","","four","null");
print_r(array_filter($listValues, "filter"));
function filter($elmnt) {
if ($elmnt != "null" && $elmnt != "" ) {
return $elmnt;
}
}

Answer 3

Use this code, First I corrected the index of an array, then unset null values from an array then corrected array indexes again:
$listValues = array("one", "two", "null","three","","four","null");
$listValues = array_values($listValues);
$temp = $listValues;
for($loop=0; $loop<count($listValues); $loop++){
if($listValues[$loop] == "" || $listValues[$loop] == "null"){
unset($temp[$loop]);
}
}
$listValues = $temp;
$listValues = array_values($listValues);
echo "<pre>";
print_r($listValues);
echo "</pre>"; die;
But, if you want same indexes to get this output:
Array ( [0] => one [1] => two [3] => three [5] => four )
Then don't use this before <pre>:
$listValues = array_values($listValues);