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【PHP】任意の時刻を操作する(ふるいやり方)

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$time = "10:00:00";

# int型に変換
$tm = strtotime($time);

# 30分すすめる
date("H:i:s", $tm+(60*30));

# 結果
10:30:00

ポイント

""で囲んで設定した$time時刻はstr型なので、strtotimeでint型(unixタイムスタンプ)に変換します。
すると、時刻を秒で扱えるようになるので、たとえば30分進めたいなら60秒/分*30分を足してください。

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