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<?php function iterateOverIt($iterable) { // First foreach acts like a guard condition foreach ($iterable as $_) { // Pre-processing: echo "<ul>\n"; // Real looping, this won't start a *NEW* iteration process but will continue the one started above: foreach ($iterable as $item) { echo "<li>", $item instanceof DateTime ? $item->format("c") : ( isset($item["col"]) ? $item["col"] : $item ), "</li>\n"; } // Post-processing: echo "</ul>\n"; break; } } // Empty array iterateOverIt([]); iterateOverIt([1, 2, 3]); // Empty generator iterateOverIt(function () : Generator { return; yield; }); iterateOverIt((function () : Generator { yield 4; yield 5; yield 6; })()); // Class with no public properties iterateOverIt(new stdClass()); iterateOverIt(new class { public $a = 7, $b = 8, $c = 9;}); /* $db = mysqli_connect("localhost", "user", "pass", "db"); // Empty resultset iterateOverIt($db->query("SELECT 0 FROM DUAL WHERE false")); iterateOverIt($db->query("SELECT 10 AS col UNION SELECT 11 UNION SELECT 12")); */ // DatePeriod generating no dates iterateOverIt(new DatePeriod(new DateTime("2020-01-01 00:00:00"), new DateInterval("P1D"), new DateTime("2020-01-01 00:00:00"), DatePeriod::EXCLUDE_START_DATE)); iterateOverIt(new DatePeriod(new DateTime("2020-01-01 00:00:00"), new DateInterval("P1D"), 3, DatePeriod::EXCLUDE_START_DATE));