The SplFixedArray class

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

Introduction

The SplFixedArray class provides the main functionalities of array. The main difference between a SplFixedArray and a normal PHP array is that the SplFixedArray must be resized manually and allows only integers within the range as indexes. The advantage is that it uses less memory than a standard array.

Class synopsis

class SplFixedArray implements IteratorAggregate, ArrayAccess, Countable, JsonSerializable {
/* Methods */
public __construct(int $size = 0)
public count(): int
public current(): mixed
public static fromArray(array $array, bool $preserveKeys = true): SplFixedArray
public getSize(): int
public key(): int
public next(): void
public offsetExists(int $index): bool
public offsetGet(int $index): mixed
public offsetSet(int $index, mixed $value): void
public offsetUnset(int $index): void
public rewind(): void
public __serialize(): array
public setSize(int $size): bool
public toArray(): array
public __unserialize(array $data): void
public valid(): bool
public __wakeup(): void
}

Changelog

Version Description
8.2.0 The SplFixedArray::__serialize() and SplFixedArray::__unserialize() magic methods have been added to SplFixedArray.
8.1.0 SplFixedArray implements JsonSerializable now.
8.0.0 SplFixedArray implements IteratorAggregate now. Previously, Iterator was implemented instead.

Examples

Example #1 SplFixedArray usage example

<?php// Initialize the array with a fixed length$array = new SplFixedArray(5);$array[1] = 2;$array[4] = "foo";var_dump($array[0]); // NULLvar_dump($array[1]); // int(2)var_dump($array["4"]); // string(3) "foo"// Increase the size of the array to 10$array->setSize(10);$array[9] = "asdf";// Shrink the array to a size of 2$array->setSize(2);// The following lines throw a RuntimeException: Index invalid or out of rangetry {    var_dump($array["non-numeric"]);} catch(RuntimeException $re) {    echo "RuntimeException: ".$re->getMessage()."\n";}try {    var_dump($array[-1]);} catch(RuntimeException $re) {    echo "RuntimeException: ".$re->getMessage()."\n";}try {    var_dump($array[5]);} catch(RuntimeException $re) {    echo "RuntimeException: ".$re->getMessage()."\n";}?>

The above example will output:

NULL
int(2)
string(3) "foo"
RuntimeException: Index invalid or out of range
RuntimeException: Index invalid or out of range
RuntimeException: Index invalid or out of range

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