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    A interface Collection

    (PECL ds >= 1.0.0)

    Introdução

    Collection é a interface base que abrange funcionalidades comuns a todas as estruturas de dados nesta biblioteca. Garante que todas as estruturas são iteráveis, contáveis e podem ser convertidas para JSON usando json_encode().

    Resumo da Interface

    interface Ds\Collection extends Countable, IteratorAggregate, JsonSerializable {
    /* Métodos */
    public clear(): void
    public copy(): Ds\Collection
    public isEmpty(): bool
    public toArray(): array
    /* Métodos herdados */
    public Countable::count(): int
    public IteratorAggregate::getIterator(): Traversable
    public JsonSerializable::jsonSerialize(): mixed
    }

    Registro de Alterações

    Versão Descrição
    PECL ds 1.4.0 Collection implementa IteratorAggregate agora, em vez de apenas Traversable. (Essa mudança ocorreu no polyfill na versão 1.4.1.)

    Índice

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    User Contributed Notes 1 note

    up
    -11
    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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