Some PHP filesystem benchmarks

fs.php

<?php

clearstatcache();

$t1 = (double)microtime(true);
for ($i = 0; $i < 100000; ++$i) {
    $result = file_exists('/tmp') && is_writable('/tmp');
}
$t2 = (double)microtime(true);
echo sprintf('file_exists + is_writable: %f' . PHP_EOL, ($t2 - $t1));

clearstatcache();

$t1 = (double)microtime(true);
for ($i = 0; $i < 100000; ++$i) {
    $result = is_dir('/tmp') && is_writable('/tmp');
}
$t2 = (double)microtime(true);
echo sprintf('is_dir + is_writable: %f' . PHP_EOL, ($t2 - $t1));

clearstatcache();

$t1 = (double)microtime(true);
for ($i = 0; $i < 100000; ++$i) {
    $stat = stat('/tmp');
    $result = (($stat['mode'] & 040200) > 0); // S_IFDIR | S_IWUSR (http://man7.org/linux/man-pages/man2/stat.2.html)
}
$t2 = (double)microtime(true);
echo sprintf('stat: %f' . PHP_EOL, ($t2 - $t1));