/**
* concat
*
* Creates a lazily concatenated stream whose elements are all the elements
* of the first stream followed by all the elements of the second stream.
*
* @param Stream $a
* @param Stream $b
* @return Stream
*/
public static function concat(S\Stream $a, S\Stream $b)
{
$items = $a->getElements() + $b->getElements();
return new S\Stream($items);
}
require __DIR__ . "/src/Producer/Producer.php";
require __DIR__ . "/src/Producer/CallableProducer.php";
$randProducer = function ($value) {
for ($i = 0; $i < $value; $i++) {
(yield mt_rand(0, ($i + 1) * 100));
}
};
$numbers = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"];
$numberformatter = function ($v) use($numbers) {
$v = (string) $v;
$str = [];
for ($i = 0, $l = strlen($v); $i < $l; ++$i) {
$str[] = $numbers[$v[$i]];
}
return implode(" ", $str);
};
$numbersReversed = array_flip($numbers);
$numberReverseFormatter = function ($v) use($numbersReversed) {
return $numbersReversed[$v];
};
$stuff = \Streams\Stream::from([1, 2, 3, 8, 5, 20, 131, 3425, 134])->flatMap($randProducer)->flatMap($randProducer)->filter(function ($v) {
return !($v % 3) || !($v % 2);
})->map($numberformatter)->flatMap(function ($formatted) {
return explode(" ", $formatted);
})->map($numberReverseFormatter)->skip(1000)->limit(200)->compile();
//echo $stuff->compile(), "\n\n";
//echo $stuff->reduce(function ($v, $acc) { return $v + $acc; }, 0), "\n";
foreach ($stuff as $formatted) {
echo $formatted, "\n";
}
echo memory_get_peak_usage() / 1024, "kb\n";
public function testLetsDoCoolThingsSuchAsMapReduce()
{
$arrayOfPhrases = array('first second third', 'first second', 'fourth second fourth', 'first second second', 'third second third');
$phrasesStream = new S\Stream($arrayOfPhrases);
$computedArray = $phrasesStream->map(function ($line) {
return array_count_values(explode(' ', $line));
})->reduce(array(), function ($acc, $next) {
foreach ($next as $word => $count) {
if (isset($acc[$word])) {
$acc[$word] += $count;
} else {
$acc[$word] = $count;
}
}
return $acc;
});
$this->assertEquals(3, $computedArray['first']);
$this->assertEquals(6, $computedArray['second']);
$this->assertEquals(3, $computedArray['third']);
$this->assertEquals(2, $computedArray['fourth']);
}
