“Mittwoche” klingt irgendwie falsch … ;)
for ($i = 0; $i < = 4; $i++) { if ($i == 0) { $next_wednesday[$i] = date("Y-m-d", strtotime("next Wednesday")); } else { $next_wednesday[$i] = date("Y-m-d", strtotime("next Wednesday", strtotime($next_wednesday[($i-1)]))); } } // DEBUG print_r($next_wednesday);