mysqli_fetch_lengths

result->lengths()

(No version information available, might be only in CVS)

result->lengths() — Returns the lengths of the columns of the current row in the result set

说明

Procedural style:

array mysqli_fetch_lengths ( mysqli_result $result )

Object oriented style (property):

mysqli_result

array$lengths;

The mysqli_fetch_lengths() function returns an array containing the lengths of every column of the current row within the result set.

参数

result: Procedural style only: A result set identifier returned by mysqli_query(), mysqli_store_result() or mysqli_use_result().

返回值

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.

范例

Example#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 */
    foreach ($result->lengths as $i => $val) {
        printf("Field %2d has Length %2d\n", $i+1, $val);
    }
    $result->close();
}

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

Example#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 */
    foreach (mysqli_fetch_lengths($result) as $i => $val) {
        printf("Field %2d has Length %2d\n", $i+1, $val);
    }
    mysqli_free_result($result);
}

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

上例将输出：

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


	PHP5中文手册 mysqli_fetch_fields mysqli_fetch_object mysqli PHP Manual mysqli_fetch_lengths result->lengths() (No version information available, might be only in CVS) result->lengths() — Returns the lengths of the columns of the current row in the result set 说明 Procedural style: array mysqli_fetch_lengths ( mysqli_result `$result` ) Object oriented style (property): mysqli_result array`$lengths`; The mysqli_fetch_lengths() function returns an array containing the lengths of every column of the current row within the result set. 参数 `result` Procedural style only: A result set identifier returned by mysqli_query(), mysqli_store_result() or mysqli_use_result(). 返回值 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. 范例 Example#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 = $result->fetch_row(); /* display column lengths / foreach ($result->lengths as $i => $val) { printf("Field %2d has Length %2d\n", $i+1, $val); } $result->close(); } / close connection / $mysqli->close(); ?> Example#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 / foreach (mysqli_fetch_lengths($result) as $i => $val) { printf("Field %2d has Length %2d\n", $i+1, $val); } mysqli_free_result($result); } / close connection */ mysqli_close($link); ?> 上例将输出： 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 mysqli_fetch_fields mysqli_fetch_object mysqli PHP Manual