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<?php

/**
 * BEM Class string generator
 *
 * @param  string  $block
 * @param  string  $element
 * @param  array   $mods
 * @param  bool    $string
 * @return string
 */
function bem($block = '', $element = null, $mods = [], $string = true) {
  $classes = []
  $classes[] = $el ? "{$block}__{$el}" : "{$block}";
  
  foreach ($mods as $mod):
    if (!$mod) continue;
    $classes[] = $el ? "{$block}__{$el}--{$mod}" : "{$block}--{$mod}";
  endforeach; // mods
  
  return $string ? implode(" ", $classes) : $classes);
}