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<?php

$a = '13:30:00';
$b = '14:40:00';

$time_a = new DateTime($a);
$time_b = new DateTime($b);

// $time _aと$time_bの時間差を取得、分で表示する
$diff = $time_a->diff($time_b, true);
$result = $diff->h * 60 + $diff->i;
var_dump($result); // int(70)