Скачать или смотреть How to Access the num_rows Property of a mysqli_result Object in PHP

Learn how to retrieve the `num_rows` property from a `mysqli_result` object in PHP. This step-by-step guide will help you easily manage database queries and get the desired results.
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This video is based on the question https://stackoverflow.com/q/65859997/ asked by the user 'Godwin Nathaniel' ( https://stackoverflow.com/u/11161325/ ) and on the answer https://stackoverflow.com/a/65860740/ provided by the user 'Kuldip Navadiya' ( https://stackoverflow.com/u/15043752/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Problem: Accessing num_rows in a mysqli_result Object

If you’re working with PHP and databases, you might have come across a situation where you need to retrieve the number of rows fetched from a database query. This is particularly useful when you want to know how many entries match specific criteria, such as an IP address.

In this post, we will address a common challenge: how to access the num_rows property from a mysqli_result object when you execute a query. By the end of this guide, you will have a clear understanding of how to extract this value and leverage it in your applications.

Example Scenario

Imagine you have a code snippet aimed at querying a database for rows that contain the current user's IP address. After running this code, you noticed that instead of simple data, it printed out a mysqli_result object containing metadata about the query result. Here’s a quick look at the output you received:

[[See Video to Reveal this Text or Code Snippet]]

In this example, you can see that the object does contain a num_rows property, but accessing it might not be clear. Let's break down how to achieve that.

Solution: Accessing the num_rows Property

To access the num_rows property from your mysqli_result object, follow these steps outlined in the code below:

Step-by-Step Code Example

Include Necessary Files: Start by including your function and database connection files.

Get the User's IP: Use a function to retrieve the user's current IP address.

Prepare and Execute Your Query: Write a SQL query to select data from your database and execute it.

Check and Access the num_rows Property: Instead of using mysqli_num_rows(), access the property directly from the object.

Here’s how your complete PHP code could look:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of Key Parts

$run_check_prod: This variable stores the result set from the query. When using mysqli_query, it returns an object of type mysqli_result.

Accessing num_rows: To retrieve the number of resulting rows, we directly access $run_check_prod->num_rows. This bypasses the need for additional functions and keeps your code cleaner and more organized.

Conclusion

Accessing the num_rows property from a mysqli_result object in PHP is straightforward once you know how to do it. By following the structured approach above, you can effectively manage your database queries and retrieve valuable data with ease.

Remember, the key to mastering database interactions in PHP is understanding how objects work and how to manipulate them effectively. Happy coding!