Когда очень нужно JSON ответ в PHP

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$jsonString = "ok;";

$jsonString .= "[";

while ($dados = $sql1->fetch_array()) {
    $jsonString .= "{";
    
    $jsonString .= "\"id\":\"";
    $jsonString .= $dados['id'];
    $jsonString .= "\",";
    
    $jsonString .= "\"cpf\":\"";
    $jsonString .= $dados['cpf'];
    $jsonString .= "\",";
    
    $jsonString .= "\"nome\":\"";
    $jsonString .= $dados['nome'];
    $jsonString .= "\",";
    
    $jsonString .= "\"tipo\":\"";
    $jsonString .= $dados['tipo'];
    $jsonString .= "\"";
    
    $jsonString .= "},";
}

$jsonString = rtrim($jsonString, ',');

$jsonString .= "]";

echo $jsonString;