Notice: Undefined index: generation.level4.generator about bettergen

[inxomnyaa]

i have no idea where this comes from ^^

Offtoppic: can you explain me yield/generators?
For example, i don't understand why yield is needed here, for me it looks like its not even necessary..

<?php
function fib($n)
{
    $cur = 1;
    $prev = 0;
    for ($i = 0; $i < $n; $i++) {
	yield $cur;
        $temp = $cur;
        $cur = $prev + $cur;
        $prev = $temp;
    }
}

$fibs = fib(9);
foreach ($fibs as $fib) {
    echo " " . $fib;
}

This here is just the same:

<?php
function fib($n)
{
	$res = [];
    $cur = 1;
    $prev = 0;
    for ($i = 0; $i < $n; $i++) {
		$res[] = $cur;
        $temp = $cur;
        $cur = $prev + $cur;
        $prev = $temp;
    }
	return $res;
}

$fibs = fib(9);
foreach ($fibs as $fib) {
    echo " " . $fib;
}

[inxomnyaa]

Notice: Undefined index: generation.level4.manager in phar://C:/Users/Administrator/Desktop/Server/MinecraftPE/WolvesFortressCSphp7/ClearSky-PocketMine-MP_1.6.2dev.phar/src/pocketmine/scheduler/AsyncTask.php on line 142

[Ad5001]

I see... will fix this this evening.

[inxomnyaa]

Oh actually i see now. it simply doesn't save an array to memory

[Ad5001]

@thebigsmileXD There is an another difference, yield pauses the function execution and execute the code on the foreach (where you can send values back using the $gen->send() function).
Your code should look like this:

<?php
function fib($n) {
    $cur = 1;
    for ($i = 0; $i < $n; $i++) {
        echo " " . $cur;
        $cur += yield $cur;
    }
}

$prev = 0;
foreach ($gen = fib(9) as $fib) {
    echo " Foreach:" . $fib;
    $gen->send($fib);
    $prev = $fib;
}

This would output:

1 Foreach:1 2 2 Foreach:2 4 4 Foreach:4 8 8 Foreach:8 16 16 Foreach:16

[Ad5001]

Uhh. What branch are you runing?

[inxomnyaa]

Not sure, i guess.. master?

[Ad5001]

Well on master, BetterNormal::$options is public. Try updating it maybe?

[Ad5001]

Do anyone still get this bug or I can close it? I cannot reproduce it.

[AvgZing]

👍