Скачать или смотреть How to Search a Nested Array in PHP to Find the Parent Array from a Child's Name

Learn how to effectively use PHP functions like `array_search` and `array_filter` to locate parent arrays based on a child's name in a nested array structure.
---
This video is based on the question https://stackoverflow.com/q/74604386/ asked by the user 'panthro' ( https://stackoverflow.com/u/1013512/ ) and on the answer https://stackoverflow.com/a/74604607/ provided by the user 'birim' ( https://stackoverflow.com/u/18724350/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Search a nested array and return the parent array?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Searching a Nested Array in PHP: Finding Parent Arrays with a Child's Name

When working with arrays in PHP, especially when they are nested, searching for values can pose a challenge. One common scenario is when you need to find a parent array based on a child's name. This guide walks you through an effective method for achieving this using built-in PHP functions.

Understanding the Problem

Suppose you have a nested array that contains information about individuals and their children. Here’s an example of such an array:

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

In this case, let's say you want to locate the entire sub-array that corresponds to the parent named 'john' based solely on the name of one of his children, for instance, 'jeff'. Doing this requires a combination of PHP array functions since array_search alone will not suffice.

Solution Overview

Using array_filter with Custom Function

To solve this problem, we can utilize array_filter in combination with a custom callback function. This will allow us to examine each element in the nested array and check for matching conditions.

The Solution in Code

Here’s how you can implement this solution in PHP:

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

Breakdown of the Code

array_filter: This function iterates over the input array and filters the elements based on the given callback function.

Callback Function: Each item in the array is checked:

($value['name'] === 'john'): checks if the parent's name is 'john'.

in_array('jeff', $value['children']): checks if 'jeff' is listed among the children of 'john'.

Result: The array_filter function returns the filtered array containing only the sub-array matching the conditions.

Why This Approach Works

Using array_filter is effective because it allows you to impose complex conditions involving both the parent's name and the presence of the child's name in the children array. By returning an array of matching entries, you can easily access the entire parent array based on the child's name.

Conclusion

In conclusion, searching for a nested array element in PHP requires a thoughtful approach. By leveraging PHP’s array_filter along with a custom callback function, you can efficiently find parent arrays based on specific conditions within nested structures. So next time you encounter a similar problem, remember this method for a quick and effective solution!

Feel free to share your thoughts or any questions in the comments below! Happy coding!