Learning points
function definition Precautions
1.PHP function parameter is defined with default values allowed;
2. normal and default parameters defined at the same time of: common parameter default parameters in front of the back
3. Overload inherited static methods and must ensure the same base class access control, consistency modifiers is overloaded [abstract] the same method
PHP- [function] - function definitions Considerations
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Origin blog.csdn.net/yueyekonglong/article/details/104025219
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