通常我不建议直接把排名最高和引用最多的关键字全部拖过来作为你的基线关键字。
Typically I would not recommend pulling both rankings and top referring keywords to get your baseline.
清单 2 内的代码存在的问题是 self 关键字绑定到了在编译时引用的属性或方法。
The problem you experienced with the code in Listing 2 is that the self keyword is bound to the referenced property or method at compile time.
PHP V5.3添加了关键字static以允许针对当前类进行引用。
PHP V5.3 has added the keyword static to allow you to make a reference against the current class.
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