src/Codec/EncodingList.php
public function when(bool $test, $encodings): self
    {
        if (!$test || is_null($encodings)) {
            return $this;
        }

        if ($encodings instanceof \Closure) {
            return $encodings($this);
        }

        if (is_string($encodings)) {
            $encodings = Encoding::custom($encodings);
        }

        $encodings = $encodings instanceof Encoding ? [$encodings] : $encodings;

        return $this->push(...$encodings);
    }
public function when(bool $test, $encodings): self
    {
        if (!$test || is_null($encodings)) {
            return $this;
        }

        if ($encodings instanceof \Closure) {
            return $encodings($this);
        }

        if (is_string($encodings)) {
            $encodings = Encoding::custom($encodings);
        }

        $encodings = $encodings instanceof Encoding ? [$encodings] : $encodings;

        return $this->push(...$encodings);
    }
Push encodings if the truth test evaluates to true.

@param bool $test
@param Encoding|string|iterable|\Closure|null $encodings
@return EncodingList