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在查看各种PHP库时,我注意到很多人选择使用单个下划线为某些类方法添加前缀,例如

public function _foo()

...代替...

public function foo()

我意识到这最终归结为个人偏好,但我想知道是否有人对这种习惯的来源有所了解.

我的想法是,它可能是从PHP 4继承的,在类方法可以被标记为受保护或私有之前,作为暗示"不要从类外调用此方法"的一种方式.然而,我也想到它可能起源于我不熟悉的某个地方(一种语言),或者背后可能有很好的推理,我会从中获益.

任何想法,见解和/或意见将不胜感激.