PHP マニュアル
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# mysqli_fetch_lengths

(PHP 5)

mysqli_fetch_lengths

(no version information, might be only in CVS)

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

## Description

Procedural style:

mixed mysqli_fetch_lengths ( object result)

Object oriented style (property):

class 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.

## Return values

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.

## Example

例 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();
?>`

例 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 examples would produce the following 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

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