Parses a .gitmodules file (named 'gitmodules') and runs git submodule add for every submodule in the file.

Add Git Submodules

<?php

$submodules = array_filter(explode("\n", file_get_contents('./gitmodules')));

for($i = 0; $i < count($submodules); $i += 3) {
  $path = str_replace('path = ', '', trim($submodules[$i + 1]));
  $url  = str_replace('url = ', '', trim($submodules[$i + 2]));

  if($path && $url) {
    $path = "./$path";
    $pathParentParts = explode('/', $path);
    $pathParent = implode('/', array_slice($pathParentParts, 0, count($pathParentParts) - 1));
    if(!is_dir($pathParent)) {
      mkdir($pathParent, '0777', TRUE);
    }
    $cmd = "git submodule add $url $path";
    echo $cmd . "\n";
    shell_exec($cmd);
  }
}