example.php

<?php

$collection = [$obj1, $obj2, $obj3];

// Dumb way
$matches = array_reduce($collection, function ($matches, $object) {
  if ($object->isMatch()) {
    $matches[] = $object;
  }
  return $matches;
}, []);

// Functionally equivalent, faster, easier to read
$matches = [];

foreach ($collection as $object) {
  if ($object->isMatch()) {
    $matches[] = $object;
  }
}

// Fancy Collection-object way
$matches = $collection->filter(function ($object) {
  return $object->isMatch();
});