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You are getting the current value from your values
array.
1- First get the corresponding key/index
$month = array(202301, 202302, 202303, 202304, 202305, 202306);
$values = array(153, 152, 170, 40, 80, 112);
$valueIndex = array_search(153, $values);
echo $valueIndex; // 0
2 – Get the corresponding month of your valueIndex
echo $month[$valueIndex]; // 202301
Source:stackexchange.com