<?php
$textFileString = '2017-03-03, 1;
2017-03-03, 2;
2017-03-03, 3;
2017-03-03, 4;
2017-03-03, 5';
$currentDate = '2017-03-03';
if (preg_match("/(\d{4}-\d{1,2}-\d{1,2}),\s(\d)\z/", $textFileString, $entryArray)) { if ($entryArray[1] == $currentDate) { //$currentDate's value comes from the post request
$bookingNumber = $entryArray[2]+1;
} else {
$bookingNumber = 1;
}
}
echo $bookingNumber;
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