check if array is null in php code example

Example 1: array should not be empty php

$arr = array();

if(!empty($arr)){
  echo "not empty";
}
else 
{
  echo "empty";
}

Example 2: check null in_array php

if (!empty($data_days) && in_array(1, $data_days, true)){ // use numeric value 1, not string