title: Find text in string in PHP
body: <p>This should be pretty straightforward, but I can't seem to find an explanation anywhere on how to do it.
  I have a string in PHP.  That string might contain within it somewhere the substring ":ERROR:".  I need to find if it has that string. <code>strpos()</code> has worked perfectly up to this point, until today when ":ERROR:" was the first item in the string, so <code>strpos()</code> returned <code>0</code>, so the program kept running thinking it had no error.</p>
  
  <p>I don't need to replace the string, or do any manipulation to it, I just need a simple <code>true/false</code> answer to "does :ERROR: exist in the string?"</p>