Filter.php

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<?php
namespace Ethereum\DataType;

class Filter extends EthDataType {

  public $fromBlock;

  public $toBlock;

  public $address;

  public $topics;

  public function __construct(EthBlockParam $fromBlock = null, EthBlockParam $toBlock = null, EthBytes $address = null, array $topics = null) {
    $this->fromBlock = $fromBlock;  
    $this->toBlock = $toBlock;  
    $this->address = $address;  
    $this->topics = $topics;
  }

  public static function getTypeArray() {
    return array( 
      'fromBlock' => 'EthBlockParam',
      'toBlock' => 'EthBlockParam',
      'address' => 'EthBytes',
      'topics' => '[EthD]',
    );
  }

  public function toArray() {
    $return = [];
    (!is_null($this->fromBlock)) ? $return['fromBlock'] = $this->fromBlock->hexVal() : NULL; 
    (!is_null($this->toBlock)) ? $return['toBlock'] = $this->toBlock->hexVal() : NULL; 
    (!is_null($this->address)) ? $return['address'] = $this->address->hexVal() : NULL; 
    (!is_null($this->topics)) ? $return['topics'] = Ethereum::valueArray($this->topics, 'EthD') : array(); 
    return $return;
  }
}