SplFixedArray::__construct

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

SplFixedArray::__constructConstructs a new fixed array

说明

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

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

参数

size

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

错误/异常

Throws a ValueError when size is a negative integer.

更新日志

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

范例

示例 #1 SplFixedArray::__construct() example

<?php
$array 
= new SplFixedArray(5);

$array[1] = 2;
$array[4] = "foo";

foreach(
$array as $v) {
  
var_dump($v);
}
?>

以上例程会输出:

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