public function prependValue($value = null)
	{
		if (! is_array($this->value))
		{
			$this->value = [$this->value];
		}

		array_unshift($this->value, $value);

		return $this;
	}
public function prependValue($value = null)
	{
		if (! is_array($this->value))
		{
			$this->value = [$this->value];
		}

		array_unshift($this->value, $value);

		return $this;
	}
public function prependValue ( $ value = null ) { if ( ! is_array ( $ this -> value ) ) { $ this -> value = [ $ this -> value ] ; } array_unshift ( $ this -> value , $ value ) ; return $ this ; }
Prepends a value to the list of values for this header. If the
header is a single value string, it will be converted to an array.

@param null $value

@return $this
Prepends a value to the list of values for this header . If the header is a single value string it will be converted to an array .