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    mysqli_result::$field_count

    mysqli_num_fields

    (PHP 5, PHP 7, PHP 8)

    mysqli_result::$field_count -- mysqli_num_fields — Gets the number of fields in the result set

    Descrizione

    Stile orientato agli oggetti

    int $mysqli_result->field_count;

    Stile procedurale

    mysqli_num_fields(mysqli_result $result): int

    Returns the number of fields in the result set.

    Elenco dei parametri

    result

    Solo nello stile procedurale: un identificatore di resultset restituito da mysqli_query(), mysqli_store_result() o mysqli_use_result().

    Valori restituiti

    An int representing the number of fields.

    Esempi

    Example #1 Stile orientato agli oggetti

    <?php

    mysqli_report    (MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    $mysqli = new mysqli("localhost", "my_user", "my_password", "world");

    $result = $mysqli->query("SELECT Name, CountryCode, District, Population FROM City ORDER BY ID LIMIT 1");

    /* Get the number of fields in the result set */
    $field_cnt = $result->field_count;

    printf("Result set has %d fields.\n", $field_cnt);

    Example #2 Stile procedurale

    <?php

    mysqli_report    (MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    $link = mysqli_connect("localhost", "my_user", "my_password", "world");

    $result = mysqli_query($link, "SELECT Name, CountryCode, District, Population FROM City ORDER BY ID LIMIT 1");

    /* Get the number of fields in the result set */
    $field_cnt = mysqli_num_fields($result);

    printf("Result set has %d fields.\n", $field_cnt);

    I precedenti esempi visualizzeranno:

    Result set has 4 fields.

    Vedere anche:

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