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@ 2022-01-28T15:54:20Z

<?php

$f = ['a', '', 'foo'];

foreach($f as $i => $str) {
    if ($str <> '') {
        var_dump($i);
    }
}

Output
Performance
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var_dump: documentation ( source)

preferences:dark modelive preview

49.45 ms | 402 KiB | 5 Q