Shell script for checking git submodule status

sample_output.txt

sites/default/modules/rest_server:
        ahead of origin/master by 14 commit(s)


sites/default/modules/services_oauth:
        behind origin/master by 1 commit(s)


sites/default/modules/oauth_common:
        ahead of origin/master by 3 commit(s)


sites/default/modules/query_builder:
        ahead of origin/master by 4 commit(s)
        Has changes

sites/default/modules/comment_resource:
        ahead of origin/master by 2 commit(s)


sites/default/modules/services_oop:
        ahead of origin/master by 1 commit(s)


1 module(s) have uncommitted changes
5 module(s) are ahead of their origin branch
1 module(s) are behind their origin branch

submodule-status

#!/usr/bin/env php
<?php
if (!file_exists('.gitmodules')) {
  print "No submodules found. This command must be run from the root of the git working direcory\n";
  exit(1);
}

$mod = fopen('.gitmodules', 'r');
if (!$mod) {
  print "Could not read the .gitmodules file\n";
  exit(1);
}

$root = getcwd();

$total_changes = 0;
$total_ahead = 0;
$total_behind = 0;

while (!feof($mod)) {
  $line = fgets($mod);
  $matches = array();
  if (preg_match('/path\s?=\s?(.+)/', $line, $matches)) {
    chdir($matches[1]);

    $path = $matches[1];
    $output = array();
    exec('git status', $output);

    $out = '';
    $unchanged = FALSE;
    $ahead = FALSE;
    $behind = FALSE;
    foreach ($output as $sline) {
      $comment = substr($sline, 0, 1) == '#';
      if ($comment) {
        if (preg_match('/Your branch is (ahead of|behind) \'([^\']+)\' by (\d+)/', $sline, $matches)) {
          $out .= "\t$matches[1] {$matches[2]} by {$matches[3]} commit(s)\n";
          if ($matches[1]=='behind') {
            $behind = TRUE;
          }
          else {
            $ahead = TRUE;
          }
        }
      }
      else {
        if (preg_match('/nothing to commit/', $sline)) {
          $unchanged = TRUE;
        }
      }
    }

    $total_changes += $unchanged ? 0 : 1;
    $total_ahead += $ahead ? 1 : 0;
    $total_behind += $behind ? 1 : 0;

    if (!$unchanged || $ahead || $behind) {
      print "$path:\n";
      print $out . ($unchanged ? '' : "\tHas changes") . "\n\n";
    }

    chdir($root);
  }
}

if ($total_changes > 0) {
  print "{$total_changes} module(s) have uncommitted changes\n";
}
if ($total_ahead > 0) {
  print "{$total_ahead} module(s) are ahead of their origin branch\n";
}
if ($total_behind > 0) {
  print "{$total_behind} module(s) are behind their origin branch\n";
}

It seems a PHP script, not a shell one