Introduction The serialize function is used to convert a PHP data structure (such as an array or object) into a string that can be stored or transferred. This function is usually used in scenarios such as caching, session management, or cross-system data transmission. However, when you need to batch a set of data, the array_map function and serialize function can be particularly powerful.

The is_nan function is a very practical tool to check if a value is "non-number" (NaN). It returns a Boolean value, which returns true if the value passed in is NaN (i.e. not a valid number), otherwise returns false.

We can use the sprintf() function to format the string. And array_map() is a very useful function that applies a callback function to every element in an array. If we want to format each element in the array quickly, we can use these two functions to achieve this. This article will explain how to use sprintf() and array_map() to quickly format each element in an array.