Скачать или смотреть Building a Custom Array from MySQL Results: A Guide to Proper Looping in PHP

Learn how to effectively loop through MySQL results in PHP to build a custom array structure, ensuring all results are included without losing data.
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Building a Custom Array from MySQL Results: A Step-by-Step Guide

When working with databases in PHP, it's common to retrieve multiple records from a MySQL query. However, you might find yourself facing an issue where only the last record of your query is being processed, resulting in incomplete or incorrect array structures. In this guide, we'll address how to properly loop through MySQL results to build a comprehensive custom array.

Understanding the Problem

Consider a scenario where you're querying a MySQL database to fetch a list of store locations. Your aim is to organize this data into a structured array. While your initial attempts may produce a structure, they often only reflect the last item fetched from the database due to the way the loop is implemented.

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What’s Wrong?

In the code snippet above, the loop is misconfigured within the array declaration. As a result, PHP doesn't process your intention correctly — it doesn't create an array of all features but instead only retains the last entry.

The Solution: Using array_map()

To solve this problem, you can utilize the array_map() function in PHP. This function allows you to apply a callback to each element of the array, resulting in a new array being generated based on your specifications.

Code Implementation

Here’s how you can effectively build the custom array using array_map():

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Breakdown of the Code

Fetching the Data:

Use $db->loadObjectList() to retrieve all records from the query.

Creating the Array Structure:

Define stores as an array with type set to 'FeatureCollection'.

For features, use array_map() to iterate over each item in $item.

Mapping Each Store:

For each $i, return an array that includes:

type as 'Feature'.

geometry, where you specify the Point type and the coordinates based on the store's latitude and longitude.

properties, which gathers all relevant store information such as image, name, contact details, and location.

Conclusion

By implementing these changes, you'll successfully loop through the MySQL results and construct a proper array that captures every entry, ensuring your final output is comprehensive and structured correctly.

This approach not only enhances your application's efficiency but also simplifies handling complex data structures in PHP. Happy coding!