SplFixedArray::__construct

(PHP 5 >= 5.3.0, PHP 7)

SplFixedArray::__construct — Constructs 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.

返回值

没有返回值。

错误／异常

Throws InvalidArgumentException when size is a negative number.

Raises E_WARNING when size cannot be parsed as a number.

范例

Example #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"

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