How to use array_filter to clear null value in php
Today, the editor will share with you the relevant knowledge points about how to use array_filter to remove null values in php. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article.
Description
1. The function of array_filter is to filter the cells in the array with a callback function. The second parameter is actually a callback function, which is executed to each member of the array.
2. If the return value of the callback function is true, this member is retained, while false is ignored.
Characteristics
If no callback function is provided, all entries in array that are equivalent to FALSE will be deleted.
Example
