<?php function checkSlotRange($as,$ae,$bs,$be){ $as = strtotime($as); $ae = strtotime($ae); $bs = strtotime($bs); $be = strtotime($be); return ($as >= $bs && $ae <= $be); } var_dump(checkSlotRange("10:30", "11:30", "09:30", "12:30")); // true var_dump(checkSlotRange("10:30", "11:30", "11:20", "12:30")); // false
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