title: Do you know of a good quick reference guide for a number of programming languages?
body: <p>In the course of my job I am maintaining code in a number of programming languages (listed below). As I haven't mastered most of them I keep forgetting the differences in syntax between them. Is there a good reference which covers (preferably for all of them on a side of A4, in a table) the basic features of the language e.g.</p>
  
  <ul>
  <li>conditional statements (if (something)
  {} or not?)</li>
  <li>comparison operators (is it =, ==, or sometimes ===? Is it &lt;> or !=)</li>
  <li>Are variables case sensitive?</li>
  <li>How do you concatenate strings? ( . &amp; or + ?)</li>
  </ul>
  
  <p>I would like this for:</p>
  
  <ul>
  <li>Python</li>
  <li>PHP</li>
  <li>Perl</li>
  <li>Javascript</li>
  <li>ASP</li>
  </ul>