PHP: checkdate() function

Last update on May 28 2022 12:26:32 (UTC/GMT +8 hours)

Description

The checkdate() is used to validate a Gregorian date.
Note : The Gregorian calendar is the internationally accepted civil calendar. It was introduced by Pope Gregory XIII, after whom the calendar was named.

Version:

(PHP 4 and above)

Syntax:

checkdate (month, day, year)

Parameters:

Name	Description	Required / Optional	Type
month	The month is from 1 to 12.	Required	Integer
day	According to the number of days come in the month specified in the month parameter. Leap years are taken into consideration.	Required	Integer
year	The year is from 1 to 32767.	Required	Integer

Return value:

TRUE if the given date is valid, otherwise returns FALSE.

Value Type: Boolean

Example:


<?php
var_dump(checkdate(11, 30, 2001));
var_dump(checkdate(2, 29, 2003));
?>

Output :

bool(true)  bool(false)

View example in browser

See also

PHP Function Reference

Previous: unixtojd
Next: date_default_ timezone_get

PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC