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<?php /** * test that filemtime() returns Unix timestamp (UTC) on current system */ $now = isset($_SERVER['REQUEST_TIME']) ? $_SERVER['REQUEST_TIME'] : time(); $timestampStartOfUnixEpoch = 0; // start of the Unix epoch. $timestampRequest = 3600 * (int)($now / 3600); $tempDir = function_exists('sys_get_temp_dir') ? sys_get_temp_dir() : '/tmp/'; $testFile = sprintf('%s/%s', $tempDir, 'test-filemtime'); printf("Testfile is '%s'.\n", $testFile); touch($testFile, $timestampStartOfUnixEpoch); php_clearstatcache(false, $testFile); $mtime = filemtime($testFile); printf("Testfile '%s' mtime should be from touch %d, is %d.\n", basename($testFile), $timestampStartOfUnixEpoch, $mtime); printf("The mtime represents %s\n", date('r', $mtime)); touch($testFile, $timestampRequest); php_clearstatcache(false, $testFile); $mtime = filemtime($testFile); printf("Testfile '%s' mtime should be from touch %d, is %d.\n", basename($testFile), $timestampRequest, $mtime); printf("The mtime represents %s\n", date('r', $mtime)); unlink($testFile); /** * @param $clear_realpath_cache * @param $filename * @link http://php.net/manual/en/function.version-compare.php */ function php_clearstatcache($clear_realpath_cache, $filename) { if (version_compare(PHP_VERSION, '5.3.0') >= 0) { clearstatcache($clear_realpath_cache, $filename); } else { clearstatcache(); } }