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PHP Checkdate () function

Syntax:
checkdate ($month, $day, $year) 
Parameters:the function takes three mandatory parameter as shown above and described below:
  • $month- this parameter specifies the month. The month must be between 1 and 12 for a valid date.
  • $day- this parameter specifies the day. The day can be in the range 1-31 depending on the month entered in order to be a valid day. In the case of a leap year, the day is in the range of 1-29, and for a non-leap year, it is in the range of 1-28.
  • $year- this parameter specifies the year. The year must be in the range 1-32767 inclusive, depending on $month and $day, to be a valid date.
  • Return Value:The function returns a boolean value. Returns true if the passed date is valid. It returns false if the passed date is not valid.Examples :
    Input: $month = 12 $day = 31 $year = 2017 Output: true Input: $month = 2 $day = 29 $year = 2016 Output: true Input: $month = 2 $day = 29 $year = 2017 Output: false 
    The programs below illustrate the checkdate() function in PHP:Program 1:The program below checks if the date is valid or not. < ? php
    // PHP program to demonstrate the checkdate() function $month = 12; $day = 31; $year = 2017;  
    // returns a boolean value after checking the date var_dump ( checkdate ( $month , $day , $year ));  
    ?>
    Output:
    bool (true ) 
    Program 2:The program below checks if the date is valid or not in case of leap year and non-leap year.
    // PHP program to demonstrate the checkdate() function
    // in case of a leap year $month = 2; $day = 29; $year = 2016;  
    // returns a boolean value after checking the date
    // leap year var_dump ( checkdate ( $month , $day , $year )); $month = 2; $day = 29; $year = 2017;  
    // returns a boolean value after checking the date
    // not a leap year var_dump ( checkdate ( $month , $day , $year ));  
    ?>
    Output:
    bool (true ) bool (false) 

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