PHP Dokumentation: Class splfixedarray
12. Januar 2010 von werner
The SplFixedArray class
Einführung
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.
Klassenbeschreibung
SplFixedArray
/* Methods */
}
Beispiele
Beispiel #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";
}
?>Das oben gezeigte Beispiel erzeugt folgendeAusgabe:
NULLint(2)string(3) "foo"RuntimeException: Index invalid or out of rangeRuntimeException: Index invalid or out of rangeRuntimeException: Index invalid or out of range
Inhaltsverzeichnis
- 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
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