Calculating Age from Date of Birth
To calculate a user's age based on their date of birth stored in an SQL database, you can leverage various methods.
PHP Calculation:
If you have the user's birthdate as a string in PHP, you can utilize the following functions:
<code class="php"><?php
$birthdate = '1999-03-15';
// PHP >= 5.3.0: Object-oriented approach
$from = new DateTime('1970-02-01');
$to = new DateTime($birthdate);
$age = $from->diff($to)->y;
// PHP >= 5.3.0: Procedural approach
$age = date_diff(date_create('1970-02-01'), date_create($birthdate))->y;
echo $age; // Output: 14
?></code>
MySQL Calculation:
In MySQL, you can calculate the age directly using the TIMESTAMPDIFF() function:
<code class="sql">SELECT TIMESTAMPDIFF(YEAR, '1999-03-15', CURDATE()) AS age;</code>
This query will return the age of the user based on the provided birthdate.
Example Integration:
To integrate this calculation into your existing code, you can modify the SQL query to retrieve the user's birthdate, then use the above methods to calculate their age before outputting it.
<code class="php"><?php
$id = intval($_GET['id']);
$dn = mysql_fetch_array($dn);
$dn = mysql_query('select username, email, skype, avatar,
date, signup_date, gender from users where id="'.$id.'"');
$dnn = mysql_fetch_array($dn);
$age = // Calculate age using any of the methods above
echo "Username: {$dnn['username']}, Age: {$age}";
?></code>The above is the detailed content of How to Calculate a User\'s Age from Their Date of Birth?. For more information, please follow other related articles on the PHP Chinese website!
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