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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.

IMPORTANT: make sure that for the key you use all elements 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


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



This article was last updated 18th January 2021 11:05 Europe/London time based on the source file dated 15th January 2021 13:05 Europe/London time.