eric@eric-dev ~/phabricator/scripts/symbols: echo 'closure.php' | ./generate_php_symbols.php 
  function php  /closure.php
 d function php 10 /closure.php
  function php  /closure.php
 a class php 3 /closure.php
a b method php 4 /closure.php

eric@eric-dev ~/phabricator/scripts/symbols: echo 'closure.php' | ./generate_php_symbols.php 
 d function php 10 /closure.php
 a class php 3 /closure.php
a b method php 4 /closure.php

<?php

class a {
  function b() {
    $c = function() { return 1; };
    $c();
  }
}

function d() {
  return 2;
}
$e = function() {
  return 3;
};