获取数组的前 N 个元素?
问题描述：
实现这一目标的最佳方法是什么?
What is the best way to accomplish this?
答
使用 array_slice()
$input = array("a", "b", "c", "d", "e");
$output = array_slice($input, 0, 3); // returns "a", "b", and "c"
只有一个小问题
如果数组索引对您有意义，请记住 array_slice 将重置和重新排序 numeric 数组索引.您需要将 preserve_keys 标志设置为 true 以避免这种情况.(第 4 个参数，从 5.0.2 开始可用).
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 set to trueto avoid this. (4th parameter, available since 5.0.2).
示例:
$output = array_slice($input, 2, 3, true);
输出:
array([3]=>'c', [4]=>'d', [5]=>'e');