Unpopular knowledge points often ignored by PHP programmers

Sometimes we are accustomed to the mainstream method and write code step by step. However, we may miss some good ideas and knowledge points. Next, I will talk about those PHP knowledge points that are easily overlooked.

• 1. array_filter function, this function filters the array through the callback function. It can be said to be very powerful, and when the callback function is empty, it can remove the hollow elements of the array.

• 2. Array_map function, novice programmers often overlook this function for batch modification of arrays. It will be very useful when we auto-increment some variables in batches.

• 3. Array_walk function, when encountering this function, many people will confuse it with array_map. First of all, its return value is bool. Secondly, the key and value of the array can be used in the callback. .

• 4. FILE_APPEND is often used to determine the newline character in different servers (windows, mac, linux).

• 5. Some magic constants such as __LINE__, __FILE__, __DIR__, __CLASS__, __TRAIT__, __METHOD__. It is with these magic constants that we can write logs accurately and find the problem accurately. Generate points.

• 6. The array_reverse function is used to reverse the array. This is very suitable for reverse sorting and is extremely efficient.

• 7. array_flip exchanges the keys and values ​​in the array.

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

• 9. array_pad function, sometimes in order to align the data and make it look neat, we can use this function to occupy the space

• 10. The difference between the array_merge function and the same key value in the front will be replaced by the later one. If you want to keep them all, use array_merge_recursive

• 11. There are many other functions that can help us solve problems quickly. PHP’s rich string array functions can be said to be one of its features

In short, for PHP, We just have to keep these trivial knowledge points in mind so that we can face complex projects and functions with ease.

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