functional.php

<?php

  function lambda() {
    if(func_num_args() > 1) {
      $func = func_get_arg(1);
      if($func[strlen($func)-1] != ';')
        $func = $func.';';
      return create_function(func_get_arg(0), 'return '.$func);
    } else {
      $func = func_get_arg(0);
      if($func[strlen($func)-1] != ';')
        $func = $func.';';
      return create_function('', 'return '.$func);
    }

  }

  function map($param,$func,$arg) {
    return array_map(lambda($param, $func),$arg);
  }

  //'each' is taken by some dumb function
  function every($func,$arg) {
    $array = array();
    foreach($arg as $a) {
      $array[] = $a;
      call_user_func($func,$a);
    }
    return $array;
  }

  function select($expr,$arg) {
    return array_filter(
      $arg,
      lambda('$_', $expr)
    );
  }
?>