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Operator overloading extension for PHP7

Usage

Implement magic methods in a class to provide operator overloading automatically, for example:

class C {
  private $value = 0;
  public function __add($delta) {
    $this->value += $delta;
    return $this;
  }

  public function __toString() {
    return strval($this->value);
  }
}

$c = new C;
var_dump($c + 5); // object(C)#1 { ["C:value:private"]=>5 }

The following overload methods are supported:

Operator Method
$o + $arg __add($arg)
$o - $arg __sub($arg)
$o * $arg __mul($arg)
$o / $arg __div($arg)
$o % $arg __mod($arg)
$o ** $arg __pow($arg)
$o << $arg __sl($arg)
$o >> $arg __sr($arg)
$o . $arg __concat($arg)
$o | $arg __bw_or($arg)
$o & $arg __bw_and($arg)
$o ^ $arg __bw_xor($arg)
~$o __bw_not()
$o === $arg __is_identical($arg)
$o !== $arg __is_not_identical($arg)
$o == $arg __is_equal($arg)
$o != $arg __is_not_equal($arg)
$o < $arg __is_smaller($arg)
$o <= $arg __is_smaller_or_equal($arg)
$o > $arg __is_greater($arg) *
$o >= $arg __is_greater_or_equal($arg) *
$o <=> $arg __cmp($arg)
++$o __pre_inc()
$o++ __post_inc()
--$o __pre_dec()
$o-- __post_dec()
$o = $arg __assign($arg)
$o += $arg __assign_add($arg)
$o -= $arg __assign_sub($arg)
$o *= $arg __assign_mul($arg)
$o /= $arg __assign_div($arg)
$o %= $arg __assign_mod($arg)
$o **= $arg __assign_pow($arg)
$o <<= $arg __assign_sl($arg)
$o >>= $arg __assign_sr($arg)
$o .= $arg __assign_concat($arg)
$o |= $arg __assign_bw_or($arg)
$o &= $arg __assign_bw_and($arg)
$o ^= $arg __assign_bw_xor($arg)

* - __is_greater() and __is_greater_or_equal() require a rebuild of the main PHP runtime using the included patch. Withtout this patch, $a > $b is automatically remapped to $b < $a by the engine.