I want to create the average age of my members. I already managed to get an array of all the date of births and found an easy way to calculate a birthday. But I don't manage to combine it.
My 'date of birth' - array:
$results = array();
$dob_array = mysqli_query($conn, "SELECT dob_array FROM members");
while($row = mysqli_fetch_assoc($dob_array)){
$results[] = $row;
}
The calculation of the age:
$today = new DateTime();
$birthdate = new DateTime("1991-01-01");
$interval = $today->diff($birthdate);
echo $interval->format('%y years');
Calculation average of my age-array:
$average = array_sum($array) / count($array);
可以使用直接sql(使用TIMESTAMPDIFF()
和AVG()
函数)完成:
SELECT AVG(TIMESTAMPDIFF(YEAR, `dob`, NOW())) as `average` FROM `member`;
这可能是一个:
SELECT AVG(DOB_COLUMN_NAME) from TABLE NAME
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