如何在php中获取jsonSerialize接口的非null值？

Question

My class implements the

jsonSerialize in php

Then my class implements the jsonSerialize method and returns get_object_vars($this).

 public function JsonSerialize()
{
    $vars = get_object_vars($this);

    return $vars;
}

The problem with this is it returns all the values including NULL variables too. How can I only get the non-null variables as json-output?

Answer 1

Pass $vars to function array_filter(). If you don't provide it a callback, it will remove everything that is equivalent with FALSE

public function JsonSerialize()
{
    $vars = array_filter(get_object_vars($this));

    return $vars;
}

If you need to remove only the NULL properties and keep other FALSE-like values (empty strings, zeroes etc) then you need to write a function that decide what to keep and what to remove:

public function JsonSerialize()
{
    $vars = array_filter(
        get_object_vars($this),
        function ($item) {
            // Keep only not-NULL values
            return ! is_null($item);
        }
    );

    return $vars;
}