How to get the last n items in a PHP array as anot

问题:

How to I get an array of the last n items of another array in PHP?

回答1:

$n is equal to the number of items you want off the end.

$arr = array_slice($old_arr, -$n);

回答2:

You can use array_slice:

$arr = array_slice($old_arr, -$n, $n, true);

If the array indices are meaningful to you, remember that array_slice will reset and reorder the numeric array indices. You need the preserve_keys flag (4th parameter) set to true to avoid this.

回答3:

You can use http://us2.php.net/array_slice.

$new = array_slice($old, $n);

However, $n is the offset to start the slice, so to calculate it, you would need to subtract this from the length of the array: $n = count($old) - $target_size.