PHP kézikönyv
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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:

array mysqli_fetch_lengths ( mysqli_result result )

Object oriented style (property):

class 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 represented by the result parameter. If successful, a numerically indexed array representing the lengths of each column is returned or `FALSE` on failure.

## Visszatérési értékek

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.

## Példák

Példa 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(); ?>`

Példa 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); ?>`

A fenti példa a következő kimenetet adja:

    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

Előző | Tartalom | Következő
mysqli_fetch_fields | Fel | mysqli_fetch_object