如何取消数组的值？

I have an array, wich has about millions of keys. But some of them are equal to "DEL", which I want to unset:

$array = array ("something1", "something2", "DEL", ... , "DEL", "DEL", "something else", "something else n");

I want to unset these keys with "DEL" from an array, but its maybe bug, it doesn't delete these values from an array. Whats the problem?

here is the code:

 <?php
    $array = {"sfsff", "DEL", ... "DEL", "bcbcgh"};

    for ($i=0; $i<sizeof($array); $i++)
    {
         if ($array[$i] == "DEL")
         {
              unset($array[$i]);
         }
    }

    var_dump($array);
?>

and here, var dump prints me out the non changed array. Whats the problem?

Try changing:

$array = {"sfsff", "DEL", "DEL", "bcbcgh"}; // Invalid array input

to

$array = ["sfsff", "DEL", "DEL", "bcbcgh"]; // this is an array

UPDATE:

From the code you shared via email, it is breaking the for loop after a few thousand iterations(45K in my case) because of memory issues. The reason is you are calculating the size of the array with every single iteration for ($i=0; $i < sizeof($array); $i++) and that is not at all a good solution while working with loops. You need to change your code to:

$length = count($newarray); // calculate the count first and then use it in the loop.
for ($i=0; $i < $length; $i++)
{
    if ($newarray[$i] == "DEL") {
        unset($newarray[$i]);
    }
}

Here, with our $length variable holding the size of the array, we don't make our application to check the length/count each time it loops. Also, I have used count() instead of sizeof() because count() takes less time to calculate the size of an array.

According to one benchmark, using a pre-calculated variable instead of forcing the count each loop can be 94% faster. That can quickly add up. Please refer to section Counting LoopsFor-loop test on the same page. You can also see the time difference taken in case of count() and sizeof().

I hope this helps.

array_filter(["sfsff", "DEL", "DEL", "bcbcgh"],function($value) {
    return $value != "DEL";
});