title: PHP Special Characters Test
body: <p>What's an efficient way of checking if a username contains a number of special characters that I define.</p>
  
  <p>Examples: % # ^ . ! @ &amp; ( ) + / " ? ` ~ &lt; > { } [ ] | = - ;</p>
  
  <p>I need to detect them and return a boolean, not just strip them out.</p>
  
  <p>Probably a super easy question but I need a better way of doing this than a huge list of conditionals or a sloppy loop.</p>