<?php $a = [ "row1" => ["col1" => "value1"], "row2" => ["col2" => "value2"], "rowN" => ["colN" => "valueN"], ]; function getKeyOfFirstValue(array $haystack, $needle) { foreach ($haystack as $row) { foreach ($row as $key => $value) { if ($value === $needle) { return $key; } } } return null; } var_export(getKeyOfFirstValue($a, 'value2'));
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