PHP Objects vs Arrays — Performance comparison while iterating

Question

I have a huge amount of PHP objects for a neural network for which I have to iterate over and perform some maths on. I was wondering if I would be better off using an associ

Answer 1

I used this code for "profiling" (1000 instances, 1000.000 reads/writes):

function p($i) {
  echo '
';
  print_r($i);
  echo '
';
}


$t0 = microtime(true);
for ($i=0; $i<1000; $i++) {
    $z = array();
    for ($j=0; $j<1000; $j++) {
        $z['aaa'] = 'aaa';
        $z['bbb'] = 'bbb';
        $z['ccc'] = $z['aaa'].$z['bbb'];
    }
}
echo '
arrays: '.(microtime(true) - $t0);
p($z);

$t0 = microtime(true);
for ($i=0; $i<1000; $i++) {
    $z = (object) null;
    for ($j=0; $j<1000; $j++) {
        $z->aaa = 'aaa';
        $z->bbb = 'bbb';
        $z->ccc = $z->aaa.$z->bbb;
    }
}
echo '
obj: '.(microtime(true) - $t0);
p($z);

echo '
 phpversion '.phpversion();

It outputs in my LINUX hosting this stuff:

arrays: 1.1085488796234

Array
(
    [aaa] => aaa
    [bbb] => bbb
    [ccc] => aaabbb
)
obj: 1.2824709415436

stdClass Object
(
    [aaa] => aaa
    [bbb] => bbb
    [ccc] => aaabbb
)
phpversion 5.2.17

so in a conclusion: objects are slower even on PHP 5.2. Don't use objects unless you really need their oop features.