title: What's quicker and better to determine if an array key exists in PHP?
body: <p>Consider these 2 examples...</p>
  
  <pre><code>$key = 'jim';
  
  // example 1
  if (isset($array[$key])) {
      // ...
  }
  
  // example 2    
  if (array_key_exists($key, $array)) {
      // ...
  }
  </code></pre>
  
  <p>I'm interested in knowing if either of these are better. I've always used the first, but have seen a lot of people use the second example on this site.</p>
  
  <p>So, which is better? Faster? Clearer intent?</p>