title: What do Option Strict and Option Explicit do?
body: <p>I saw this post:</p>
  
  <blockquote>
    <p>Typos…  Just use option strict and explicit please..  during one software development project, which I was on as a consultant, they were getting ridiculous amounts of errors everywhere… turned out the developer couldn’t spell and would declare variables with incorrect spelling.. no big deal, until you use the correct spelling when you’re assigning a value to it…  and  you had option explicit off.  Ouch to them…"</p>
  </blockquote>
  
  <p>What is <code>Option Strict</code> and <code>Option Explicit</code> anyway? I have googled it up but can't get the idea (because mostly it's Visual Basic, I'm doing PHP).</p>