title: Remove a string from the beginning of a string
body: <p>I have a string that looks like this:</p>
  
  <pre><code>$str = "bla_string_bla_bla_bla";
  </code></pre>
  
  <p>How can I remove the first <code>bla_</code>; but only if it's found at the beginning of the string?</p>
  
  <p>With <code>str_replace()</code>, it removes <em>all</em> <code>bla_</code>'s.</p>