php-明示的なキャストにもかかわらず、奇妙な浮動小数点の結果の動作

 $hour1 = (float) $date1 / 10000;
$hour1 = (float) floor($hour1);

$hour2 = (float) $date2 / 10000;
$hour2 = (float) floor($hour2);

$minute1 = (float) $date1 / 10000;
$minute1 = (float) $minute1 - floor($minute1);
$minute1 = (float) $minute1 / 60;
$minute1 = (float) $minute1 * 100;

$minute2 = (float) $date2 / 10000;
$minute2 = (float) $minute2 - floor($minute2);
$minute2 = (float) $minute2 / 60;
$minute2 = (float) $minute2 * 100;

$date = (float) ($hour1 + minute1) - ($hour2 + minute2);
$date = floatval($date);
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ご覧のとおり、型キャストを少しやりすぎました。

可変値

 $minute1 = .564478
$hour1 = 19

$minute2 = .9885546
$hour2 = 8
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$date = (float) ($hour1 + minute1) - ($hour2 + minute2);

IS