SplFixedArray::__construct

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

SplFixedArray::__construct — Constructs a new fixed array

public function SplFixedArray::__construct(int $size = 0)

Initializes a fixed array with a number of null values equal to size.

size: The size of the fixed array. This expects a number between 0 and PHP_INT_MAX .

Throws a ValueError when size is a negative integer.

版本	说明
8.0.0	Now throws a ValueError if `size` is a negative; previously it threw a InvalidArgumentException .

示例 #1 SplFixedArray::__construct() example

<?php
$array = new SplFixedArray(5);
$array[1] = 2;
$array[4] = "foo";
foreach($array as $v) {
 var_dump($v);
}
?>

以上示例会输出:

NULL
int(2)
NULL
NULL
string(3) "foo"