search
HomeBackend DevelopmentPHP TutorialPHP SPL standard library SplFixedArray usage example, splsplfixedarray_PHP tutorial

PHP SPL standard library SplFixedArray usage example, splsplfixedarray

SplFixedArray is mainly the main function related to processing arrays. Different from ordinary php array, it is of fixed length, and The advantage of arrays with numbers as keys is that they are faster to process than ordinary arrays.

Look at my native Benchmark test:

ini_set('memory_limit','12800M');
 
for($size = 10000; $size < 10000000; $size *= 4) {
  echo PHP_EOL . "Testing size: $size" . PHP_EOL;
  for($s = microtime(true), $container = Array(), $i = 0; $i < $size; $i++) $container[$i] = NULL;
  echo "Array(): " . (microtime(true) - $s) . PHP_EOL;
 
  for($s = microtime(true), $container = new SplFixedArray($size), $i = 0; $i < $size; $i++) $container[$i] = NULL;
  echo "SplArray(): " . (microtime(true) - $s) . PHP_EOL;
}

The results are as follows:

Testing size: 10000
Array(): 0.004000186920166
SplArray(): 0.0019998550415039
 
Testing size: 40000
Array(): 0.017001152038574
SplArray(): 0.0090007781982422
 
Testing size: 160000
Array(): 0.050002098083496
SplArray(): 0.046003103256226
 
Testing size: 640000
Array(): 0.19701099395752
SplArray(): 0.16700983047485
 
Testing size: 2560000
Array(): 0.75704312324524
SplArray(): 0.67303895950317

Usually SplFixedArray is 20%~30% faster than PHP array, so if you are dealing with a huge number of fixed-length arrays, it is still strongly recommended.
The SplFixedArray class summary is as follows:

SplFixedArray implements Iterator  , ArrayAccess  , Countable  {
  /* 方法 */
  public __construct ([ int $size = 0 ] )
  public int count ( void )
  public mixed current ( void )
  public static SplFixedArray fromArray ( array $array [, bool $save_indexes = true ] )
  public int getSize ( void )
  public int key ( void )
  public void next ( void )
  public bool offsetExists ( int $index )
  public mixed offsetGet ( int $index )
  public void offsetSet ( int $index , mixed $newval )
  public void offsetUnset ( int $index )
  public void rewind ( void )
  public int setSize ( int $size )
  public array toArray ( void )
  public bool valid ( void )
  public void __wakeup ( void )
}

Use SplFixedArray:

$arr = new SplFixedArray(4);
$arr[0] = 'php';
$arr[1] = 1;
$arr[3] = 'python';
 
//遍历, $arr[2] 为null
foreach($arr as $v) {
  echo $v . PHP_EOL;
}
 
//获取数组长度
echo $arr->getSize(); //4
 
//增加数组长度
$arr->setSize(5);
$arr[4] = 'new one';
 
//捕获异常
try{
  echo $arr[10];
} catch (RuntimeException $e) {
  echo $e->getMessage();
} 

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/998567.htmlTechArticlePHP SPL standard library SplFixedArray usage examples, splsplfixedarray SplFixedArray is mainly the main function related to processing arrays, and is different from ordinary php array The difference is that it is of fixed length, and...
Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
What is the difference between the unset() and unlink() functions ?What is the difference between the unset() and unlink() functions ?Apr 30, 2025 pm 03:33 PM

The article discusses the differences between unset() and unlink() functions in programming, focusing on their purposes and use cases. Unset() removes variables from memory, while unlink() deletes files from the filesystem. Both are crucial for effec

What are Traits in PHP ?What are Traits in PHP ?Apr 30, 2025 pm 03:31 PM

PHP traits enable code reuse in single inheritance contexts, offering benefits like reusability and simplified inheritance. They can be effectively combined with traditional inheritance to enhance class flexibility and modularity.

Is PHP supports multiple inheritance ?Is PHP supports multiple inheritance ?Apr 30, 2025 pm 03:30 PM

PHP does not support multiple inheritance but uses interfaces and traits as alternatives to achieve similar functionality, avoiding issues like the diamond problem.

What is inheritance in PHP ?What is inheritance in PHP ?Apr 30, 2025 pm 03:29 PM

Inheritance in PHP allows classes to inherit properties and methods, promoting code reuse and hierarchical organization. Key benefits include reusability, abstraction, and polymorphism. Common mistakes to avoid are overuse of inheritance and ignoring

What are the main error types, and how do they differ?What are the main error types, and how do they differ?Apr 30, 2025 pm 03:28 PM

The article discusses three main error types in programming: syntax, runtime, and logical errors. It explains their causes, prevention strategies, impacts on performance and user experience, and methods for diagnosis and resolution.

How can PHP and HTML interact?How can PHP and HTML interact?Apr 30, 2025 pm 03:27 PM

Article discusses PHP and HTML interaction, best practices for embedding PHP in HTML, dynamic HTML content generation, and recommended development tools.

What is the difference between for and foreach loop in PHP?What is the difference between for and foreach loop in PHP?Apr 30, 2025 pm 03:26 PM

The article discusses the differences between for and foreach loops in PHP, focusing on syntax, usage, control, and performance. Foreach is preferred for array iteration due to simplicity and efficiency, but for loops are better for index-based opera

Explain the importance of Parser in PHP.for eachExplain the importance of Parser in PHP.for eachApr 30, 2025 pm 03:25 PM

The article discusses the crucial role of the PHP parser in script execution, focusing on its tasks in syntax analysis, error handling, and code optimization, and how its efficiency impacts web application performance.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function

SublimeText3 English version

SublimeText3 English version

Recommended: Win version, supports code prompts!

SublimeText3 Linux new version

SublimeText3 Linux new version

SublimeText3 Linux latest version

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor