Array union experiment

test 1.php

<?php
$b = rand(0, 1);
$c = rand(0, 1);
for($i = 0; $i < 1000000; $i++) {
    $a = ['foo' => 1];
    
    if($b) {
        $a['bar'] = 2;
    }
    
    if($c) {
        $a['baz'] = 3;
    }
}

test 2.php

<?php
$b = rand(0, 1);
$c = rand(0, 1);
for($i = 0; $i < 1000000; $i++) {
    $a = ['foo' => 1]
        + ($b?['bar' => 2]:[])
        + ($c?['baz' => 3]:[]);
}