gistfile1.php

<?php

$obj1 = new StdClass;
$obj2 = new StdClass;
$obj3 = new StdClass;

$obj1->name = "Joe";
$obj2->name = "Jane";
$obj3->name = "Johnny";

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

// Order by longest name property
usort($collection, function($a, $b) {
    $aLength = strlen($a->name);
    $bLength = strlen($b->name);

    if ($aLength == $bLength) {
        return 0;
    }

    return ($aLength > $bLength) ? -1 : 1;
});

echo $collection[0]->name;