PHP Array Intersect dont include empty arrays

user_3081759 0
Viewed 2938

I have 4 arrays, which are going to be different every time I run my code. Sometimes, maybe empty. I am using array_intersect to get the common value from the set of arrays and if any one of the array is empty it returns me an empty array. I want array_intersect to ignore empty array's.

Example:

$array1 = array('441', '442', '443');
$array2 = array('441', '443');
$array3 = array('441', '442',);
$array4 = array();

var_dump(array_intersect($array1, $array2, $array3, $array4));

// Returns
array('');

// Required
array('441');

How do I make it ignore $array4 and give an output of 441

arrays php
4 Answers

If you store your arrays as an array you can do this:

<?php
// create array of arrays
$array[] = array('441', '442', '443');
$array[] = array('441', '443');
$array[] = array('441', '442');
$array[] = array();

// filter out empty array
$array = array_filter($array);

// pass in array (inline argument unpacking PHP > 5.6)
print_r(array_intersect(...$array));

Array
(
    [0] => 441
)

https://3v4l.org/MD3r2

user_6618720 
$tempArray = [];
if (count($g_arr) >0) $tempArray[] = $g_arr;
if (count($c_arr) >0) $tempArray[] = $c_arr;
if (count($k_arr) >0) $tempArray[] = $k_arr;
if (count($m_arr) >0) $tempArray[] = $m_arr;
if (count($p_arr) >0) $tempArray[] = $p_arr;

$intersect = call_user_func_array('array_intersect', $tempArray);
user_40765160

Have a look on below solution: 

$array = array(); //initialize $arrar
$array[] = array('441', '442', '443');
$array[] = array('441', '443');
$array[] = array('441', '442',);
$array[] = array();
$array = array_filter($array); //filter empty array
$res_arr = array_shift($array); // Shift an element off the beginning of array
foreach($array as $filter){
        $res_arr = array_intersect($res_arr, $filter);
}

print_r($res_arr);

Output

Array ( [0] => 441 )

See example at: https://3v4l.org/Rkt1R

user_17877100 
$array1 = array('441', '442', '443');
$array2 = array('441', '443');
$array3 = array('441', '442',);
$array4 = array();


function get_intersect(...$arrays){
    $instersect_arrays = array();

    foreach($arrays as $array){
        if(!empty($array)){
            array_push($instersect_arrays,$array);
        }
    }

    return call_user_func_array('array_intersect', $instersect_arrays);
}

var_dump(get_intersect($array1, $array2, $array3, $array4));

//output: array(1) { [0]=> string(3) "441" }
user_80831920
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