PHP date format legality regular verification code_PHP tutorial

php date format legality regular verification code This PHP regular date tutorial provides three date formats to verify whether the date entered by the user is correct. The second is to use regular date verification, and the other is to use checkdate to verify.

php tutorial date format legality regular verification code

This PHP regular date tutorial provides three date formats to verify whether the date entered by the user is correct. The second is to use regular date verification, and the other is to use checkdate to verify.
*/
$days = date("y-m-d");

//Method 1 regular verification date

$reg="/d{4}-d{2}-d{2}/";
preg_match($reg,$days,$arr);
print_r($arr);

//Method 2 uses cehckdate to verify

$k = explode('-',$days);
if( checkdate($k[1],$k[2],$k[0]) )
{
echo $days,'date is legal';
}
else
{
echo 'Not a valid date';
}

//Method 3 simple and intuitive regular verification

if( ereg("(19|20)[0-9]{2}-(0[1-9]|1[0-2])-(0[1-9]|[12][ 0-9]|3[01])$",$days))
{
echo $days,'is a valid date';
}
else
{
echo

'Invalid date';
}

/*
About checkdate function

The checkdate() function verifies a Gregorian date.

If the specified value is legal, the function returns true, otherwise it returns false.

Dates are legal if:
month is between and including 1 - 12
The value of day is within the range of days that a given month should have, taking leap years into account.
year is between and including 1 to 32767

The verification format is month/day/year

Original tutorial on this site, reprinted from www.bKjia.c0m/phper/php.html
*/

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