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ReflectionFunctionAbstract::isGenerator is a method in PHP's Reflection API. It is used to determine whether a function or method is a generator function or not.

A generator function in PHP is a special type of function that can be paused and resumed, allowing it to generate a sequence of values on the fly, rather than generating them all at once and returning them in an array.

To use ReflectionFunctionAbstract::isGenerator, you need to create an instance of the ReflectionFunction or ReflectionMethod class, which represents the function or method you want to inspect. You can then call the isGenerator method on this instance.

Here is an example:

php
function myGenerator() {
yield 1;
yield 2;
yield 3;
}

$reflection = new ReflectionFunction('myGenerator');
$isGenerator = $reflection->isGenerator();

if ($isGenerator) {
echo 'The function is a generator.';
} else {
echo 'The function is not a generator.';
}


In this example, the myGenerator function is a generator function. We create a ReflectionFunction instance for this function and then call the isGenerator method. If the function is a generator, the isGenerator method will return true, and we can display a corresponding message.

Note that ReflectionFunctionAbstract::isGenerator is available from PHP 5.5 onwards.