SplFixedArray (class)
The SplFixedArray class
Introduction
(PHP 5 >= 5.3.0, PHP 7)
The SplFixedArray class provides the main functionalities of array. The main differences between a SplFixedArray and a normal PHP array is that the SplFixedArray is of fixed length and allows only integers within the range as indexes. The advantage is that it allows a faster array implementation.
Class synopsis
/* Methods */
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 )}
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]); // NULL var_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 $array->setSize(2); // The following lines throw a RuntimeException: Index invalid or out of range try { var_dump($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
Table of Contents
- SplFixedArray::__construct — Constructs a new fixed array
- SplFixedArray::count — Returns the size of the array
- SplFixedArray::current — Return current array entry
- SplFixedArray::fromArray — Import a PHP array in a SplFixedArray instance
- SplFixedArray::getSize — Gets the size of the array
- SplFixedArray::key — Return current array index
- SplFixedArray::next — Move to next entry
- SplFixedArray::offsetExists — Returns whether the requested index exists
- SplFixedArray::offsetGet — Returns the value at the specified index
- SplFixedArray::offsetSet — Sets a new value at a specified index
- SplFixedArray::offsetUnset — Unsets the value at the specified $index
- SplFixedArray::rewind — Rewind iterator back to the start
- SplFixedArray::setSize — Change the size of an array
- SplFixedArray::toArray — Returns a PHP array from the fixed array
- SplFixedArray::valid — Check whether the array contains more elements
- SplFixedArray::__wakeup — Reinitialises the array after being unserialised
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https://secure.php.net/manual/en/class.splfixedarray.php