title: Does Index of Array Exist
body: <p>I've inherited some code at work that has a really bad smell.  I'm hoping to find the most painless solution possible.</p>
  
  <p>Is there a way to check if some arbitrary number is a valid element in an array?</p>
  
  <p>Example - I need to check if array[25] exists.</p>
  
  <p>Preferably I would prefer to do this without doing a foreach() through the array to found the rows.</p>
  
  <p>Is there any way to do this, or am I stuck with foreach loop?</p>