// Collection
$collection_a = new \Ds\Vector([1, 2, 3]);
$collection_b = new \Ds\Vector();
var_dump($collection_a, $collection_b);
/*
object(Ds\Vector)[1]
public 0 => int 1
public 1 => int 2
public 2 => int 3
object(Ds\Vector)[2]
*/
//json_encode
var_dump( json_encode($collection_a));
/*
string '[1,2,3]
*/
//count
var_dump(count($collection_a));
/*
int 3
*/
// serialize
var_dump(serialize($collection_a));
/*
string 'C:9:"Ds\Vector":12:{i:1;i:2;i:3;}'
*/
// foreach
foreach ($collection_a as $key => $value) {
echo $key ,'--', $value, PHP_EOL;
}
/*
0--1
1--2
2--3
*/
// clone
$clone = clone($collection_a);
var_dump($clone);
/*
object(Ds\Vector)[1]
public 0 => int 1
public 1 => int 2
public 2 => int 3
*/
// push
$clone->push('aa');
var_dump($clone);
/*
object(Ds\Vector)[3]
public 0 => int 1
public 1 => int 2
public 2 => int 3
public 3 => string 'aa' (length=2)
*/
// isEmpty
var_dump($collection_a->isEmpty(), $collection_b->isEmpty());
/*
boolean false
boolean true
*/
// toArray
var_dump($collection_a->toArray(), $collection_b->toArray());
/*
array (size=3)
0 => int 1
1 => int 2
2 => int 3
array (size=0)
empty
*/
// copy ( void )
//浅拷贝， shallow copy
$collection_c = $collection_a->copy();
var_dump($collection_c);
/*
object(Ds\Vector)[3]
public 0 => int 1
public 1 => int 2
public 2 => int 3
*/
$collection_c->push(4);
var_dump($collection_a, $collection_c);
/*
object(Ds\Vector)[1]
public 0 => int 1
public 1 => int 2
public 2 => int 3
object(Ds\Vector)[3]
public 0 => int 1
public 1 => int 2
public 2 => int 3
public 3 => int 4
*/
// clear
$collection_a->clear();
$collection_b->clear();
$collection_c->clear();
var_dump($collection_a, $collection_b, $collection_c);
/*
object(Ds\Vector)[1]
object(Ds\Vector)[2]
object(Ds\Vector)[3]
*/
The Collection interface
(PECL ds >= 1.0.0)
Introduction
Collection is the base interface which covers functionality common to all the data structures in this library. It guarantees that all structures are traversable, countable, and can be converted to json using json_encode().
Interface synopsis
/* Methods */
/* Inherited methods */
}Changelog
| Version | Description |
|---|---|
| PECL ds 1.4.0 | Collection implements IteratorAggregate now instead of just Traversable. (This change came to the polyfill in 1.4.1.) |
Table of Contents
- Ds\Collection::clear — Removes all values
- Ds\Collection::copy — Returns a shallow copy of the collection
- Ds\Collection::isEmpty — Returns whether the collection is empty
- Ds\Collection::toArray — Converts the collection to an array
add a note
User Contributed Notes 1 note
depakin at yisangwu dot com ¶
4 years ago
