mysqli_fetch

Manuale PHP
Indietro		Avanti

Description

Procedural style:

mixed mysqli_fetch_lengths ( mysqli_result result )

Object oriented style (property):

class mysqli_result {

mixed lengths

}

The mysqli_fetch_lengths() function returns an array containing the lengths of every column of the current row within the result set represented by the result parameter. If successful, a numerically indexed array representing the lengths of each column is returned or FALSE on failure.

Valori restituiti

An array of integers representing the size of each column (not including any terminating null characters). FALSE if an error occurred.

mysqli_fetch_lengths() is valid only for the current row of the result set. It returns FALSE if you call it before calling mysqli_fetch_row/array/object or after retrieving all rows in the result.

Esempi

Esempio 1. Object oriented style


<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

$query = "SELECT * from Country ORDER BY Code LIMIT 1";

if ($result = $mysqli->query($query)) {

    $row = $result->fetch_row();

    /* display column lengths */
    for ($i=0; $i < count($result->lengths); $i++) {
        printf("Field %2d has Length %2d\n", $i+1, $result->lengths[$i]);
    }
    $result->close();
}

/* close connection */
$mysqli->close();
?>

Esempio 2. Procedural style


<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

$query = "SELECT * from Country ORDER BY Code LIMIT 1";

if ($result = mysqli_query($link, $query)) {

    $row = mysqli_fetch_row($result);

    /* display column lengths */
    $lengths = mysqli_fetch_lengths($result);
    for ($i=0; $i < count($lengths); $i++) {
        printf("Field %2d has Length %2d\n", $i+1, $lengths[$i]);
    }
    mysqli_free_result($result);
}

/* close connection */
mysqli_close($link);
?>

The above example will output:

Field  1 has Length  3
Field  2 has Length  5
Field  3 has Length 13
Field  4 has Length  9
Field  5 has Length  6
Field  6 has Length  1
Field  7 has Length  6
Field  8 has Length  4
Field  9 has Length  6
Field 10 has Length  6
Field 11 has Length  5
Field 12 has Length 44
Field 13 has Length  7
Field 14 has Length  3
Field 15 has Length  2

Indietro	Partenza	Avanti
mysqli_fetch_fields	Risali	mysqli_fetch_object