union_bench_results

Without opcache/jit:

empty_loop                         0.142
func($x)                           0.608    0.465
func(int $x)                       0.653    0.511
func(int|float|string $x)          0.653    0.511
func($x): int                      0.689    0.547
func($x): int|float|string         0.751    0.609
func(int $x): int                  0.757    0.615
func($a,$b,$c,$d,$e)               1.129    0.987
func(int $a,$b,$c,$d,$e): int      1.120    0.978
Foo::$static_prop = ...            0.289    0.147
Foo::$static_typed_prop = ...      0.425    0.283
Foo::$static_union_prop = ...      0.422    0.280
$o->prop = ...                     0.298    0.156
$o->typed_prop = ...               0.433    0.291
$o->union_prop = ...               0.501    0.359
Foo::$static_prop += 2             0.331    0.189
Foo::$static_typed_prop += 2       0.480    0.338
Foo::$typed_union_prop += 2        0.482    0.340
$o->prop += 2                      0.458    0.316
$o->typed_prop += 2                0.573    0.431
$o->union_prop += 2                0.572    0.430
$static_prop_ref = ...             0.259    0.117
$static_typed_prop_ref = ...       0.529    0.387
$static_union_prop_ref = ...       0.573    0.431
$static_prop_ref += 2              0.258    0.116
$static_typed_prop_ref += 2        0.537    0.394
$static_union_prop_ref += 2        0.538    0.396
func($obj)                         0.617    0.475
func(?A $obj)                      0.754    0.612
func(A|B|C|null $obj)              0.772    0.630
func(A|B|C|null $obj)              0.984    0.842

With opcache/jit:

empty_loop                         0.068
func($x)                           0.264    0.196
func(int $x)                       0.258    0.190
func(int|float|string $x)          0.266    0.198
func($x): int                      0.343    0.275
func($x): int|float|string         0.344    0.276
func(int $x): int                  0.333    0.264
func($a,$b,$c,$d,$e)               0.491    0.423
func(int $a,$b,$c,$d,$e): int      0.486    0.417
Foo::$static_prop = ...            0.226    0.158
Foo::$static_typed_prop = ...      0.336    0.268
Foo::$static_union_prop = ...      0.338    0.269
$o->prop = ...                     0.230    0.162
$o->typed_prop = ...               0.333    0.265
$o->union_prop = ...               0.336    0.268
Foo::$static_prop += 2             0.270    0.202
Foo::$static_typed_prop += 2       0.435    0.366
Foo::$typed_union_prop += 2        0.436    0.367
$o->prop += 2                      0.386    0.318
$o->typed_prop += 2                0.551    0.483
$o->union_prop += 2                0.548    0.480
$static_prop_ref = ...             0.103    0.034
$static_typed_prop_ref = ...       0.504    0.436
$static_union_prop_ref = ...       0.506    0.438
$static_prop_ref += 2              0.095    0.026
$static_typed_prop_ref += 2        0.452    0.384
$static_union_prop_ref += 2        0.452    0.384
func($obj)                         0.305    0.237
func(?A $obj)                      0.509    0.441
func(A|B|C|null $obj)              0.579    0.511
func(A|B|C|null $obj)              0.837    0.768