如何检查数组索引是否包含值

Question

I have an array with some values in different spots. I want to check if there is a value in the index then put it in a new array starting at 0 then put in index 1 then next value at index 2 and so on. I need to shorten it and move them all to the left really.

Array ( [0] => 53 [1] => [2] => 55 [3] => 76 [4] => [5] => [6] => [7] => )

The new array would be:

newArray ( [0] => 53 [1] =>55 [2] => 76)

Maybe something like this:

for ($i=0; $i < sizeof($questionWorth); $i++)
{ 
    if($questionWorth[$i] has a value)
    {
       put it in new array starting at index zero
       then increment the index of new array
    }
}

Answer 1

To only get values that is not NULL or empty you could use array_filter() and array_values() like this:

$array = array(76, NULL, NULL, 56);
// remove empty values from array, notice that since no callback
// is supplied values that evaluates to false will be removed
$array = array_filter($array);
// since array_filter will preserve the array keys
// you can use array_values() to reindex the array numerically
$array = array_values($array);
// prints Array ( [0] => 76 [1] => 56 ) 
print_r($array);