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    mysqli_result::$num_rows

    mysqli_num_rows

    (PHP 5, PHP 7, PHP 8)

    mysqli_result::$num_rows -- mysqli_num_rows — Gets the number of rows in the result set

    Descrizione

    Stile orientato agli oggetti

    int|string $mysqli_result->num_rows;

    Stile procedurale

    mysqli_num_rows(mysqli_result $result): int|string

    Returns the number of rows in the result set.

    The behaviour of mysqli_num_rows() depends on whether buffered or unbuffered result sets are being used. This function returns 0 for unbuffered result sets unless all rows have been fetched from the server.

    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 fetched rows. Returns 0 in unbuffered mode unless all rows have been fetched from the server.

    Nota:

    If the number of rows is greater than PHP_INT_MAX, the number will be returned as a string.

    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 Code, Name FROM Country ORDER BY Name");

    /* Get the number of rows in the result set */
    $row_cnt = $result->num_rows;

    printf("Result set has %d rows.\n", $row_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 Code, Name FROM Country ORDER BY Name");

    /* Get the number of rows in the result set */
    $row_cnt = mysqli_num_rows($result);

    printf("Result set has %d rows.\n", $row_cnt);

    I precedenti esempi visualizzeranno:

    Result set has 239 rows.

    Note

    Nota:

    In contrast to the mysqli_stmt_num_rows() function, this function doesn't have object-oriented method variant. In the object-oriented style, use the getter property.

    Vedere anche:

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    User Contributed Notes 3 notes

    up
    123
    borisigna
    13 years ago
    If you have problems making work this num_rows, you have to declare ->store_result() first.

    <?php
    $mysqli     = new mysqli("localhost","root", "", "tables");

    $query = $mysqli->prepare("SELECT * FROM table1");
    $query->execute();
    $query->store_result();

    $rows = $query->num_rows;

    echo     $rows;

    // Return 4 for example
    ?>
    up
    2
    min0u
    7 years ago
    This function doesn't work with LIMIT used jointly with SQL_CALC_FOUND_ROWS. If you want to obtain the total rows found you must do it manually, example:

    <?php
    public function errorList(int $limit=25,int $offset=0){
                $errorList = array();
                $result = $this->con->query("SELECT SQL_CALC_FOUND_ROWS id, erreur FROM Erreurs ORDER BY id DESC LIMIT $limit OFFSET $offset");
            while(    $row = $result->fetch_assoc()){
                    $errorList[] = new Erreur($row);
            }
                $result->free();
                // $foundRows = $result->num_rows; // 25
                $foundRows = $this->con->query("SELECT FOUND_ROWS() as foundRows");
                $this->foundRows = $foundRows->fetch_assoc(); // 178
                return $errorList;
    }
    ?>
    up
    -30
    justso at inbox dot ru
    8 years ago
    in php 5.3.8 had unexpected troubles when checking for mysqli_result::$num_rows
    If the result of the query is empty then var_dump of the result will be like this:
    class mysqli_result#5 (5) {
      public $current_field => NULL
      public $field_count => NULL
      public $lengths => NULL
      public $num_rows => NULL
      public $type => NULL
    }
    but var_dump($result->num_rows) will give integer-typed zero instead of NULL:
    int(0)
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