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The Collection interface

(PECL ds >= 1.0.0)

Introducción

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().

Sinopsis de la Interfaz

interface Ds\Collection extends Countable, IteratorAggregate, JsonSerializable {
/* Métodos */
public clear(): void
public isEmpty(): bool
public toArray(): array
/* Métodos heredados */
}

Historial de cambios

Versión Descripción
PECL ds 1.4.0 Collection implements IteratorAggregate now instead of just Traversable. (This change came to the polyfill in 1.4.1.)

Tabla de contenidos

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User Contributed Notes 1 note

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depakin at yisangwu dot com
4 years ago
// 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]
*/
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