title: String Replace in PHP
body: <p>I have string named <code>File_Test_name_1285931677.xml</code>. <code>File</code> is the common word and <code>1285931677</code> is a random number.
  I want to remove <code>File_</code> and <code>_1285931677.xml</code>, i.e. prefix up to first <code>_</code> and suffix from  last <code>_</code> on.</p>