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@ 2018-06-28T12:30:05Z

<?php

$_POST = [
    'wind_1' => 'hk',
    'hamburger_66' => 'foo',
    'wind_2' => 'pop',
    'wind_25' => 'another'
];

foreach ($_POST as $k => $v) {
    if (strpos($k, 'wind_') === 0) {
        $key = $k;
    }
}
echo filter_var($key, FILTER_SANITIZE_NUMBER_INT);

Output
Performance
VLD
References
Branches

strpos: documentation ( source)
filter_var: documentation ( source)

preferences:dark modelive preview

53.19 ms | 402 KiB | 5 Q