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@ 2018-12-17T21:03:32Z

<?php

$array = Array
(
    Array
        (
            "what" => "b4",
            "map" => "74,76,77,83"
        ),

    Array
        (
            "what" => "b2",
            "map" => "53,82"
        ),

    Array
        (
            "what" => "b1",
            "map" => "36"
        )
 );

function abc($array, $what) {
   return $array[array_search($what, array_column($array, 'what'))]['map'];
}	

echo abc($array, "b4");

Output
Performance
VLD
References
Branches

array_column: documentation ( source)
array_search: documentation ( source)

preferences:dark modelive preview

15.89 ms | 402 KiB | 5 Q