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@ 2014-07-18T14:01:15Z

<?php

$dt = '1990-07-22 00:00:00';
$year_calc = 60 * 60 * 24 * 365;
$year_strict = 31556926;

var_dump([
    'year_calc' => $year_calc,
    'year_strict' => $year_strict,
    'now' => time(),
    'age_calc' => floor(abs((time() - strtotime($dt))/$year_calc)),
    'age_strict' => floor(abs((time() - strtotime($dt))/$year_strict)),
]);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
abs: documentation ( source)
time: documentation ( source)
floor: documentation ( source)
strtotime: documentation ( source)

preferences:dark modelive preview

31.05 ms | 402 KiB | 5 Q