Shulou(Shulou.com)06/03 Report--

In this issue, the editor will bring you what are the unpopular knowledge points about the problems encountered by PHP programmers. The article is rich in content and analyzes and describes for you from a professional point of view. I hope you can get something after reading this article.

Sometimes we are used to the mainstream method and write code step by step, but we may miss some good ideas and knowledge points. Then I will talk about those php knowledge points that are easy to ignore.

1. Array_filter function, which filters the array through the callback function. It can be said to be very powerful, and when the callback function is empty, the hollow elements of the array can be removed.

2. Array_map function, novice programmers often ignore this function to modify the array in batches, and it will be very useful when we add some variables in batches.

3. Array_walk function. When you encounter this function, many people will be confused with array_map. First, its return value is bool, and secondly, the key,value of the array can be used in callbacks.

4. FILE_APPEND is often used to judge newline characters in different servers (windows,mac, linux).

5. Some magic constants such as _ _ LINE__,__FILE__,__DIR__,__CLASS__,__TRAIT__,__METHOD__, have these magic constants so that we can accurately write log and find the exact source of the problem.

6. Array_reverse function, used to reverse the array, which is very suitable for flashback sorting, extremely efficient.

7. Array_flip exchanges keys and values in the array.

8. The sprinf function is used to fill in string placeholders, such as replacing specified location variables in template text messages or emails.

9. Array_pad function, we can sometimes use this function to make the data look neat and aligned.

10. The difference between the array_merge function and +. The value of the same key in the front will be replaced by the latter, and the latter will be replaced by the previous one. If you want to keep both, you can only use array_merge_recursive.

11. There are many other functions that can help us solve problems quickly, and php's rich string array functions can be said to be one of its features.

In short, for php, we need to keep these trivial knowledge points in mind so that we can cope with complex projects and functions.

These are the unpopular knowledge points of the problems encountered by PHP programmers that Xiaobian shared with you. If you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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