title: What Exception subclasses are built into PHP?
body: <p>I have not yet been able to find a list of all the built-in Exception sub classes in PHP.  I'd rather use built in ones when they make sense, before creating my own exception subclasses.</p>
  
  <p>For example, I know InvalidArgumentException exists, but there appears to be nothing comparable to Java's NullPointerException.</p>
  
  <p>Does anyone have or can link to a list of the available Exception subclasses in PHP?</p>