src/MimeMailer/MimeMessage.php
public function substitution($search, $replace)
    {
        $this->body = str_replace($search, $replace, $this->body);
        return $this->body;
    }
public function substitution($search, $replace)
    {
        $this->body = str_replace($search, $replace, $this->body);
        return $this->body;
    }
Make a basic substitution in the object body

@param string $search The string to search
@param string $replace The string to use for replacement
@return string The generated body