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<form action="" method="GET">
	<input type="text" name="year">
	<input type="submit">
</form>

<?php
	if (isset($_REQUEST['year'])) {
		$year = $_REQUEST['year'];
		$arr = [];
		for($i = 1; $i <= 12; $i++) {
			$mktime = mktime(0, 0, 0, $i, 13, $year);
			if (date('w', $mktime) == 5) {
				$arr[] = date('d-m-Y', $timestamp);
				echo $arr[] = date('d-m-Y', $mktime) . "</br>";
			}
		}
		var_dump($arr);
	}
?>