<?php $_POST = [ 'wind_1' => 'hk', 'hamburger_66' => 'foo', 'wind_2' => 'pop', 'wind_25' => 'another', 'wind_13' => 'bar', 'pass_wind_99' => 'stank', ]; var_export( (int) max( preg_filter( '/^wind_(\d+)$/', '$1', array_keys($_POST) ) ) );
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