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array_flip_by_value_key()

Description

Flip array keys to use one of the keys of the values it contains. All elements (ie values) of the array must contain
the key (ie. they are arrays). Helper function to greatly increase search performance on huge PHP arrays.
Normal use is: array_flip_by_value_key($huge_array, 'ref');


IMPORTANT: make sure that for the key you intend to use all elements will have a unique value set.

Example: Result after calling array_flip_by_value_key($nodes, 'ref');
[20382] => Array
(
[ref] => 20382
[name] => Example node
[parent] => 20381
)

Parameters

ColumnTypeDefaultDescription
$a array
$k string A values' key to use as an index/key in the main array, ideally an integer

Return

array

This article was last updated 30th January 2023 08:35 Europe/London time based on the source file dated 19th January 2023 09:30 Europe/London time.