/**
* @param \Dja\Db\Model\Query\BaseQuerySet $qs
* @param int $chunkSize
* @return \Iterator
*/
function chunkedIterator(\Dja\Db\Model\Query\BaseQuerySet $qs, $chunkSize = 1000)
{
$qs = clone $qs;
$baseLimit = $qs->_qb()->getMaxResults();
$allCount = $qs->doCount();
$expectingResultsCount = $baseLimit !== null ? min($baseLimit, $allCount) : $allCount;
$numIters = ceil($expectingResultsCount / $chunkSize);
foreach (xrange(0, $numIters - 1) as $offsetMultiplier) {
$offset = $offsetMultiplier * $chunkSize;
$qs->_qb()->setFirstResult($offset)->setMaxResults($chunkSize);
foreach ($qs as $key => $row) {
(yield $key => $row);
}
}
}
function testVariants($count) {
testTraversable(
"xrange ($count)",
function() use($count) { return xrange(0, $count); }
);
testTraversable(
"RangeIterator ($count)",
function() use($count) { return new RangeIterator(0, $count); }
);
testTraversable(
"urange ($count)",
function() use($count) { return urange(0, $count); }
);
testTraversable(
"range ($count)",
function() use($count) { return range(0, $count); }
);
}
function xrange($start, $limit, $step = 1)
{
if ($start < $limit) {
if ($step <= 0) {
throw new LogicException('Step must be +ve');
}
foreach (range($start, $limit, $step) as $i) {
(yield $i);
}
} else {
if ($step >= 0) {
throw new LogicException('Step must be -ve');
}
foreach (range($start, $limit, $step) as $i) {
(yield $i);
}
}
}
/**
注意下面range()和xrange()输出的结果是一样的。
**/
echo 'Single digit odd numbers from range(): ';
foreach (range(1, 9, 2) as $number) {
echo "{$number} ";
}
echo "\n";
echo 'Single digit odd numbers from xrange(): ';
foreach (xrange(1, 9, 2) as $number) {
echo "{$number} ";
}
echo "\n";
use Ulrichsg\Getopt\Getopt;
use Ulrichsg\Getopt\Option;
require_once 'init.php';
// Set up our command line arguments.
$playerOption = (new Option(null, 'playerId', Getopt::REQUIRED_ARGUMENT))->setDescription('The ID of the player to calculate for (required)')->setValidation($vNotBlank);
$args = array_merge($DatabaseOptions, [$playerOption]);
$options = new Getopt($args);
// Parse the command-line arguments and connect to the database.
try {
$options->parse();
} catch (UnexpectedValueException $e) {
echo $e->getMessage() . "\n";
echo $options->getHelpText() . "\n";
exit;
}
// Connect to the database.
$pdo = connectToDatabase($options);
// Prepare the SQL. The base SQL allows for a rolling mean to be created from
// a hard-coded set of game numbers. Here we modify that SQL so that we can
// loop over a set of game numbers and store rolling mean data for each game
// number for each player.
$sql = file_get_contents('hitter-rolling-mean.sql');
$sql = str_replace('FROM', ', :s1 AS start_game, :e1 AS end_game FROM ', $sql);
$sql = str_replace('/* AND p.id = */', ' AND p.id=:pid ', $sql);
$sql = str_replace('1 AND 10', ' :s2 AND :e2 ', $sql);
$sql = 'INSERT INTO hitter_rolling_mean ' . $sql;
$stmt = $pdo->prepare($sql);
// Calculate the rolling mean in groups of 10 games.
foreach (xrange(1, 152) as $startGameNumber) {
$stmt->execute([':pid' => $options['playerId'], ':s1' => $startGameNumber, ':s2' => $startGameNumber, ':e1' => $startGameNumber + 10, ':e2' => $startGameNumber + 10]);
}
<?php
function xrange($start, $end, $step = 1)
{
for ($i = $start; $i <= $end; $i += $step) {
(yield $i);
}
}
$gen = xrange(1, 10);
foreach ($gen as $num) {
echo $num, "\n";
}
function gen()
{
$ret = (yield 'yield1');
var_dump($ret . " | in gen()");
$ret = (yield 'yield2');
var_dump($ret . " | in gen()");
}
$gen = gen();
var_dump($gen->rewind());
var_dump($gen->current());
// string(6) "yield1"
var_dump($gen->send('ret1'));
// string(4) "ret1" (the first var_dump in gen)
// string(6) "yield2" (the var_dump of the ->send() return value)
var_dump($gen->send('ret2'));
class Task
{
protected $taskId;
protected $coroutine;
<?php
function xrange($start, $limit, $step = 1) {
for ($i = $start; $i <= $limit; $i += $step) {
yield $i;
}
}
echo 'Single digit odd numbers: ';
/*
* Note that an array is never created or returned,
* which saves memory.
*/
foreach (xrange(1, 210000, 3) as $number) {
echo "$number ";
}
echo "echo \n";
for ($i = 1; $i <= 210000; $i++) {
echo $i . ",";
}
echo "\n";
echo memory_get_usage(true) . PHP_EOL;
?>
<?php
function xrange($start, $end, $step = 1)
{
for ($i = $start; $i <= $end; $i += $step) {
(yield $i);
}
}
foreach (xrange(10, 20, 2) as $i) {
var_dump($i);
}
if ($step <= 0) {
throw new LogicException('Step must be +ve');
}
for ($i = $start; $i <= $limit; $i += $step) {
(yield $i);
}
} else {
if ($step >= 0) {
throw new LogicException('Step must be -ve');
}
for ($i = $start; $i >= $limit; $i += $step) {
(yield $i);
}
}
}
foreach (xrange(0, 10, 1) as $number) {
echo $number . "<br/>";
}
$gen = (function () {
(yield 1);
(yield 2);
(yield 3);
return 4;
})();
//返回 123
foreach ($gen as $val) {
echo $val, PHP_EOL;
}
//返回4
echo $gen->getReturn(), PHP_EOL;
function gen()
<?php
function xrange($start, $end, $step = 1)
{
for ($i = $start; $i < $end; $i += $step) {
(yield $i);
}
}
foreach (xrange(1, 10) as $num) {
echo $num, "\n";
}
use App\Task;
/**
* Created by PhpStorm.
* User: Jason
* Date: 11/21/2015
* Time: 11:20 PM
*/
require_once "vendor/autoload.php";
function xrange($start, $end, $step = 1)
{
for ($i = $start; $i <= $end; $i += $step) {
$ret = (yield $i);
echo "i is {$i}, ret is {$ret} \n";
}
}
$range = xrange(1, 5);
var_dump($range->rewind());
/*var_dump($range->current());
var_dump($range->next());*/
//var_dump($range->current());
var_dump($range->send("test"));
var_dump($range->send("test2"));
/*foreach ($range as $num) {
echo $num, "\n";
}*/
//var_dump($range); // object(Generator)#1
//var_dump($range instanceof Iterator); // bool(true)
echo "## Second Test \n";
function getTaskId()
{
return new SystemCall(function (Task $task, Scheduler $scheduler) {
function xrange($start, $limit, $step = 1)
{
if ($start < $limit) {
if ($step <= 0) {
throw new LogicException('step must be +ve');
}
for ($i = $start; $i < $limit; $i += $step) {
(yield $i);
}
} else {
if ($step >= 0) {
throw new LogicException('step must be +ve');
}
for ($i = $start; $i >= $limit; $i += $step) {
(yield $i);
}
}
}
//10000000
$xrange = xrange(1, 20, 2);
print_r($xrange->key());
echo PHP_EOL;
//echo 'Single digit odd numbers from xrange(): ';
foreach ($xrange as $number) {
echo "{$number} ";
echo PHP_EOL;
}
//print_r($result);
echo PHP_EOL;
echo memory_get_usage();
echo PHP_EOL;
