What resources or documentation can be helpful for understanding date sorting functions in PHP and MySQL?

When sorting dates in PHP and MySQL, it's important to use the correct date format and functions to ensure accurate sorting. In PHP, the `strtotime()` function can be used to convert date strings into timestamps for sorting. In MySQL, the `ORDER BY` clause can be used with the `DATE()` function to sort dates correctly. 

// Example PHP code snippet for sorting dates
$dates = array("2022-01-15", "2021-12-20", "2022-02-05");

usort($dates, function($a, $b) {
    return strtotime($a) - strtotime($b);
});

foreach($dates as $date) {
    echo $date . "<br>";
}

Keywords

PHP MySQL date sorting documentation resources

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