How to Accurately Count Properties of a stdClass Object in PHP?

Counting the Properties of a stdClass Object in PHP

When working with objects created from JSON data using json_decode, you might encounter an issue where the count() function returns an incorrect value despite the object having numerous properties.

The Issue

Consider the following example:

[trends] => stdClass Object
    (
        [2009-08-21 11:05] => Array
            (
                [0] => stdClass Object
                    (
                        [query] => "Follow Friday"
                        [name] => Follow Friday
                    )

                ...
                [19] => stdClass Object
                    (
                        [query] => H1N1
                        [name] => H1N1
                    )

            )
     )

Running count($obj) on this object would return 1, even though there are 30 properties. This is because count() is designed to count the number of indexes in an array, not the properties of an object.

The Solution

To resolve this issue, cast the object to an array like so:

$total = count((array)$obj);

Casting the object as an array forces count() to evaluate the number of properties instead of indexes. In this example, $total would accurately reflect the count of 30 properties.

Note

This casting technique may not always be applicable. However, for simple stdClass objects like the one provided, it should suffice to obtain the correct property count.

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