/PHP/Php remove line if it contains string

Php remove line if it contains string

$rows = file("problem.txt");    
$blacklist = "foo|bar|lol";

foreach($rows as $key => $row) {
    if(preg_match("/($blacklist)/", $row)) {
        unset($rows[$key]);
    }
}

file_put_contents("solved.txt", implode("\n", $rows));

Source: stackoverflow.com

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