DetermineAgePHPFunction
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[edit] Determine Age In Years Given Date Of Birth PHP Function - Support
This is the official support page for The freebert.com Free Determine Age In Years Given Date Of Birth PHP Function. Clink on the link for a full description, code listing and example for The freebert.com Free Determine Age In Years Given Date Of Birth PHP Function.
[edit] Full Example
To fully illustrate how to use this function, see the code below. The code is complete, and can be copied and pasted into a PHP page and opened to see it work in action:
<?php
// Example Age Input
$DateOfBirth=19770226;
// Calculate Age Using Function:
$Age= DetermineAgeFromDOB ($DateOfBirth);
// Display Results
echo "A person born on ".$DateOfBirth." is now ".$Age." years old.";
// Define the function
function DetermineAgeFromDOB ($YYYYMMDD_In)
{
// Parse Birthday Input Into Local Variables
// Assumes Input In Form: YYYYMMDD
$yIn=substr($YYYYMMDD_In, 0, 4);
$mIn=substr($YYYYMMDD_In, 4, 2);
$dIn=substr($YYYYMMDD_In, 6, 2);
// Calculate Differences Between Birthday And Now
// By Subtracting Birthday From Current Date
$ddiff = date("d") - $dIn;
$mdiff = date("m") - $mIn;
$ydiff = date("Y") - $yIn;
// Check If Birthday Month Has Been Reached
if ($mdiff < 0)
{
// Birthday Month Not Reached
// Subtract 1 Year From Age
$ydiff--;
} elseif ($mdiff==0)
{
// Birthday Month Currently
// Check If BirthdayDay Passed
if ($ddiff < 0)
{
//Birthday Not Reached
// Subtract 1 Year From Age
$ydiff--;
}
}
return $ydiff;
}
?>
[edit] Questions & Feedback
Post any questions, issues, problems, and comments you may have regarding this function below.
[edit] Posted June 16 2008
The script works fine as is. But how would I go about writing a script that prompts a user for their birthday so that it is assigned to the .$DateOfBirth variable? This way a user could type in their birthday and the script would calculate their age.
Thanks. Art
---> Response: Use an HTML form (POST or GET), use 1 drop down box each for day, month, and year. Upon form submission, take the submitted values (POST or GET), put them into 1 string using format YYYYMMDD. Plug that into the function as in the example above and place the output in user friendly text based output (also as in the example above). For more info, lookup using POST and GET with PHP here.
[edit] Posted July 28 2008
The Script works well if I only use it once in a table, however if I use it more than once I get the following error.
Fatal error: Cannot redeclare determineagefromdob() Do I have to stop the scrip so that it can start again? If so, how do I do that?
Thanks
Darylt
---> Response: You only need to declare the function once per page. You can use the function multiple times, but only need to declare it once. In the example above, the function is USED by the line:
$Age= DetermineAgeFromDOB ($DateOfBirth);
The function is declared by the following lines (and everything inbetween):
function DetermineAgeFromDOB ($YYYYMMDD_In)
{
...
}
I hope that helps.
freebert.com
[edit] Posted January 4th 2010
I found this script kicks up errors/warnings (PHP 5 and later I think) if you do not set the defaul timezone somewhere in the script e.g.:
<?php
date_default_timezone_set('Europe/London'); // sets your default timezone
?>
Hope this clears things up for anyone who was having this problem.
John Hird
