如何在PHP中翻转日期[重复]

This question already has an answer here:

Convert one date format into another in PHP 15 answers

My form inputs a date as dd/mm/yyyy, however my database uses a yyyy-mm-dd format. How do I flip the dates into the database format along with the difference of '/' and '-'?

$first_date = $_REQUEST["date_1"];

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You can simply use:

$date = date('Y-m-d H:i:s', strtotime($first_date);

You can use PHP's datetime class:

$dateTime = new DateTime($first_date);
$dateTime = $dateTime->format('Y-m-d');