您通常不需要这样做，因为在大多数情况下，PHP都会为您强制类型.对于确实要明确转换类型的情况， 播放 它:

You don't typically need to do this, since PHP will coerce the type for you in most circumstances. For situations where you do want to explicitly convert the type, cast it:

$num = "3.14";
$int = (int)$num;
$float = (float)$num;