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<?php $arr = ["1549440811" => 1, "1549448226" => 2, "1551108588" => 3 ]; $range = "1549460338"; $filtered = array_filter( $arr, function ($key) use ($range) { return $range > $key; }, ARRAY_FILTER_USE_KEY ); print_r($filtered);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [1549440811] => 1 [1549448226] => 2 )

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