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<?php $array = [ "date_2018_08" => 81, "date_2018_09" => 70, "date_2018_10" => 70, "date_2018_11" => 95, "date_2018_12" => 75, "date_2019_01" => 91, "date_2019_02" => 78, "date_2019_03" => 95, "date_2019_04" => 68 ]; $year = 2019; $filtered = array_filter( $array, function ($key) use ($year) { $parts = explode("_", $key); return $parts[1] >= $year; }, ARRAY_FILTER_USE_KEY ); print_r($filtered);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [date_2019_01] => 91 [date_2019_02] => 78 [date_2019_03] => 95 [date_2019_04] => 68 )

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