Array and object truthiness

gistfile1.php

<?php

@$i = $argv[1] ?: 1000;

$c = array();
$s = microtime(true);
for ($j = 0; $j < $i; $j++) {
    if ($c) {}
}
echo 'Empty Array:  ' . (microtime(true) - $s) . "\n";

$c = range(0, 10000);
$s = microtime(true);
for ($j = 0; $j < $i; $j++) {
    if ($c) {}
}
echo 'Large Array:  ' . (microtime(true) - $s) . "\n";

$c = range(0, 10000);
$s = microtime(true);
for ($j = 0; $j < $i; $j++) {
    if (empty($c)) {}
}
echo 'Lg w/Empty(): ' . (microtime(true) - $s) . "\n";

$obj = new SplObjectStorage();
for ($i = 0; $i < 1000; $i++) {
    $obj->attach(new SplObjectStorage());
}

$s = microtime(true);
for ($j = 0; $j < $i; $j++) {
    if ($obj) {}
}
echo 'Large Object: ' . (microtime(true) - $s) . "\n";

$s = microtime(true);
for ($j = 0; $j < $i; $j++) {
    if (count($c) === 0) {}
}
echo 'Using count:  ' . (microtime(true) - $s) . "\n";

$ php ~/projects/perf/if_checks.php 1000
Empty Array:  0.0003509521484375
Large Array:  0.00031280517578125
Lg w/Empty(): 0.00031495094299316
Large Object: 0.00024008750915527
Using count:  0.0012218952178955