因为是一种动态的、弱类型语言，PHP非常灵活。
It is flexible by being a dynamic and weakly typed language.
极端情况下，弱类型语言(例如assembler)允许将任意数据类型赋给另一种类型(不管这种赋值是否有意义)。
At the extreme endpoints, a weakly typed language such as Assembler lets you assign any data type to any other (whether the assignment makes sense or not).
静态类型的语言既可以有强类型，也可以有弱类型；而动态类型系统通常是强类型的，但也不完全是。
Statically typed languages can have strong or weak typing; dynamically typed systems are usually, though not exclusively, strongly typed.
对于那些习惯于强类型语言的人来说，这可能像是一种阻碍，但是这种弱类型耦合使Ruby语言能够实现某些更强大的特性。
While this may seem like a hindrance to those accustomed to strongly typed languages, this loose-type coupling enables some of the more powerful features of the Ruby language.
实际上，在类型检查的下面，不同的语言会对应着，从弱到强的一个定型范围。
And in fact, under type checking, different languages sometimes fall on a spectrum from weak to strong typing.
实际上，在类型检查的下面，不同的语言会对应着，从弱到强的一个定型范围。
And in fact, under type checking, different languages sometimes fall on a spectrum from weak to strong typing.
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