How do I check that the given string is a valid month or not?

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I'm making a function to check the month is valid or not. For eg.

PHP

checkMonth("Feb") => true
checkMonth("Mar") => true
checkMonth(02) => true
checkMonth(2) => true

But

PHP

checkMonth("X") => false
checkMonth("XYZ") => false

There is no issue in the numeric form 2 or 02. But if I'm passing argument like "X" or "XYZ" its not working and returns true.

Im trying

PHP

echo date('n', strtotime("XYZ"));

which is returning true because the value of date('n', strtotime("XYZ")) is 3 which is a valid month.

I also tried

PHP

$mon=date_format(date_create("XYZ"),"n");

But it has the same affect.

Posted 12-Mar-15 22:14pm

Samartha Sinha

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Peter Leow · Answer 1 · 2015-03-12T22:46:00

Solution 1

Try this idea: put all the month names in an array, then use in_array function to check:
http://php.net/manual/en/function.in-array.php[^]
+++++[Round 2]+++++
ok, try strtotime()[^]
e.g.

PHP

if (strtotime('Jun')) echo 1; else echo 0;

Posted 12-Mar-15 22:46pm

Peter Leow

Updated 13-Mar-15 3:30am

v3

Comments

Samartha Sinha 13-Mar-15 4:59am

That can be one way of doing it. But isn't there any function in php that can check the string is valid month or not?

Peter Leow 13-Mar-15 6:31am

use strtotime, added in solution.

Samartha Sinha 13-Mar-15 6:43am

I've done that its not working.

Peter Leow 13-Mar-15 7:00am

Test my example code on any free online php test tool such as http://phptester.net/

Samartha Sinha 13-Mar-15 7:19am

If you do
if (strtotime('X'))
echo 1;
else
echo 0;
The result is 1
But it should be 0

Peter Leow 13-Mar-15 9:29am

Then adopt my first suggestion.

W∴ Balboos, *GHB* · Answer 2 · 2015-03-13T05:23:00

You could simply list all of your possible good answers in a switch statement with a fall-through and anything else fails.

Example:

PHP

switch($isMonth) {
  case 'JAN':
  case  1:
  case '01':
  case 'FEB': 
     etc etc etc.
           return 1;
           break; // Not really needed after a return statement but it's a habit.
  default:  return 0
} //

You may want to convert $isMonth to upper case or lower case before your test or you'll need to include every variation.