今子どもが何ヶ月なのかを求める | Codetter（こーどったー）

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//月齢（年齢は無視して何ヶ月か）を求める
$m = date('m') - $birth_month_1;
echo '<br>';
if ( $birth_day_1 > date('j') ) {
    $m--;
}
echo '<br>';
if ( $m < 0 ) {
    $m = $m+12;
}
echo $m.'ヶ月';
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