<?php $array = [ 'company 1' => [1981 => 1, 1945 => 3], 'company 2' => [1990 => 18, 2005 => 13], 'company 3' => [1950 => 6, 2012 => 9] ]; $minYear = 9999; $maxYear = 0; foreach ($array as $row) { foreach ($row as $year => $value) { if ($year > $maxYear) { $maxYear = $year; } if ($year < $minYear) { $minYear = $year; } } } echo "MinYear = $minYear, MaxYear = $maxYear";
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