Editing Generator (computer programming) (section)

===PHP===
[[File:UML generator in PHP.svg|thumb|UML class diagram depiction of the inheritance chain of the Generator class in PHP]]
The community of [[PHP]] implemented generators in PHP 5.5. Details can be found in the original [https://wiki.php.net/rfc/generators Request for Comments: Generators].

Infinite Fibonacci sequence:
<syntaxhighlight lang="php">
function fibonacci(): Generator
{
    $last = 0;
    $current = 1;
    yield 1;
    while (true) {
        $current = $last + $current;
        $last = $current - $last;
        yield $current;
    }
}

foreach (fibonacci() as $number) {
    echo $number, "\n";
}
</syntaxhighlight>

Fibonacci sequence with limit:
<syntaxhighlight lang="php">
function fibonacci(int $limit): Generator 
{
    yield $a = $b = $i = 1;
 
    while (++$i < $limit) {
        yield $a = ($b = $a + $b) - $a;
    }
}

foreach (fibonacci(10) as $number) {
    echo "$number\n";
}
</syntaxhighlight>

Any function which contains a <span style="font-family: 'Courier New';">yield</span> statement is automatically a generator function.