PHP implementation of converting date to age

This article mainly introduces the implementation of converting PHP root date into age. It has a certain reference value. Now I share it with everyone. Friends in need can refer to it

/*
 * @param cheack age
 */
function howOld($birth) {
    $birthday = strtotime($birth);//int strtotime ( string $time [, int $now ] )
    $year = date('Y', $birthday);
    if(($month = (date('m') - date('m', $birthday))) < 0){
        $year++;
    }else if ($month == 0 && date('d') - date('d', $birthday) < 0){
        $year++;
    }
    return date('Y') - $year;

}

$data["birthday"] = $this->howOld($birthday);
       var_dump($data["birthday"]);

　

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