获取数组的前n个元素?

PHP manual: array_slice

$input = array("a", "b", "c", "d", "e");
$output = array_slice($input, 0, 3);   // returns "a", "b", and "c"

array_slice preserve_keys true

$output = array_slice($input, 2, 3, true);

array([3]=>'c', [4]=>'d', [5]=>'e');

array_slice

$sliced_array = array_slice($array,0,$N);

array_slice()

array_slice()

<?php
$input = array("a", "b", "c", "d", "e");

$output = array_slice($input, 2);      // returns "c", "d", and "e"
$output = array_slice($input, -2, 1);  // returns "d"
$output = array_slice($input, 0, 3);   // returns "a", "b", and "c"

// note the differences in the array keys
print_r(array_slice($input, 2, -1));
print_r(array_slice($input, 2, -1, true));
?>

array_splice()

http://docs.php.net/manual/da/function.array-splice.php

$array_without_n_elements = array_splice($old_array, 0, N)