How to I get an array of the last n items of another array in PHP?
如何获得PHP中另一个数组的最后n项的数组?
3 个解决方案
#1
41
$n is equal to the number of items you want off the end.
$n等于你想要结束的项目的数量。
$arr = array_slice($old_arr, -$n);
#2
4
You can use array_slice:
您可以使用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.
如果数组索引对您有意义，请记住array_slice将重置和重新排序数值数组索引。您需要将preserve_keys标记(第4个参数)设置为true，以避免出现这种情况。
#3
-2
You can use http://us2.php.net/array_slice.
您可以使用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) - $target_size.
但是，$n是开始切片的偏移量，因此要计算它，需要从数组的长度中减去它:$n = count($old) - $target_size。
#1
41
$n is equal to the number of items you want off the end.
$n等于你想要结束的项目的数量。
$arr = array_slice($old_arr, -$n);
#2
4
You can use array_slice:
您可以使用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.
如果数组索引对您有意义，请记住array_slice将重置和重新排序数值数组索引。您需要将preserve_keys标记(第4个参数)设置为true，以避免出现这种情况。
#3
-2
You can use http://us2.php.net/array_slice.
您可以使用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) - $target_size.
但是，$n是开始切片的偏移量，因此要计算它，需要从数组的长度中减去它:$n = count($old) - $target_size。