Data Structures
PHP Manual

The Collection interface

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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

Ds\Collection implements Traversable , Countable , JsonSerializable {
/* Methods */
abstract public void clear ( void )
abstract public Ds\Collection copy ( void )
abstract public bool isEmpty ( void )
abstract public array toArray ( void )

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Data Structures
PHP Manual