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@ 2015-04-19T22:41:10Z

<?php

interface IDBResult {
    function FetchAssoc();
    function Rewind();
    function NumRows();
}

class DBResult implements IDBResult {

    private $_records = array(
        array('abc' => 'def'),
        array('foo' => 'bar'),
        array('fizz' => 'buzz'),
    );
    private $_i = 0;

    function FetchAssoc() {
        return isset($this->_records[$this->_i]) ? $this->_records[$this->_i++] : null;
    }
    function Rewind() {
        $this->_i = 0;
    }
    function NumRows() {
        return count($this->_records);
    }
}

class ResultIterator implements Iterator {

	private $_rs;
	private $_rec;
	private $_index = 0;
	private $_onLoad;

	function __construct(IDBResult $rs, callable $callback = null) {
		$this->_rs = $rs;
		$this->_onLoad = $callback ?: function($rec, $i) { return $rec; };
	}

	public function current() {
		return call_user_func_array($this->_onLoad, array($this->_rec, $this->_index));
	}

	public function key() {
		return $this->_index;
	}

	public function next() {
		$this->_rec = $this->_rs->FetchAssoc();
		$this->_index++;
	}

	public function rewind() {
		$this->_index = 0;
		$this->_rs->Rewind();
		$this->_rec = $this->_rs->FetchAssoc();
	}

	public function valid() {
		return $this->_index < $this->_rs->NumRows();
	}

}

$rs = new DBResult();
$it = new ResultIterator($rs, function($rec, $i) { return [$i, key($rec), $rec[key($rec)]]; });
foreach($it as $rec) {
    print_r($rec);
}

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Return type of ResultIterator::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/U4NGL on line 41 Deprecated: Return type of ResultIterator::next() should either be compatible with Iterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/U4NGL on line 49 Deprecated: Return type of ResultIterator::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/U4NGL on line 45 Deprecated: Return type of ResultIterator::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/U4NGL on line 60 Deprecated: Return type of ResultIterator::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/U4NGL on line 54 Array ( [0] => 0 [1] => abc [2] => def ) Array ( [0] => 1 [1] => foo [2] => bar ) Array ( [0] => 2 [1] => fizz [2] => buzz )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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