Answers for "empty arr php"

remove empty array elements php

$colors = array("red","","blue",NULL);

$colorsNoEmptyOrNull = array_filter($colors, function($v){ 
 return !is_null($v) && $v !== ''; 
});
//$colorsNoEmptyOrNull is now ["red","blue"]

declare empty array in php

$emptyArray = []; 
$emptyArray = array();
$emptyArray = (array) null;