Two ways to delete array elements in php. Differences in usage of unset and array_splice

$arr = array('a','b','c','d');
unset($arr[1]);
print_r($arr);
 ?>

Results: Array ( [0] => a [2] => c [3] => d ) How can the missing elements be filled and the array re-indexed? The answer is array_splice():

Example:

$arr = array('a','b','c','d');
array_splice($arr,1,1);
print_r($arr) ;
?>

Result: Array ( [0] => a [1] => c [2] => d ) Delete specific elements in the array (bbs.it-home.org Scripting School):

$arr2 = array(1,3, 5,7,8);
foreach ($arr2 as $key=>$value)
{
 if ($value == = 3)
 unset($arr2[$key]);
}
var_dump($arr2);
?>

Delete empty arrays:

 $array = ('a' => "abc", 'b' => "bcd",'c' =>"cde",'d' => ;"def",'e'=>"");
 array_filter($array);
 echo "";
 print_r($array);
?>

result: Array ( [a] => abc => bcd [c] => cde [d] => def )

Summary: If the array_splice() function is deleted, the index value of the array will also change. If the unset() function deletes it, the index value of the array will not change.