mysqli_result::free
mysqli_result->num_rows
MySQLi_Result
PHP Manual

# mysqli_result->lengths

# mysqli_fetch_lengths

(PHP 5)

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

### Descripción

Object oriented style (property):

mysqli_result
array $lengths;

Procedural style:

array mysqli_fetch_lengths ( mysqli_result `$result` )

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

### Lista de parámetros

`result`

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

### Valores retornados

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.

### Ejemplos

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);
?>`

El resultado del ejemplo seria:

    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_result::free
mysqli_result->num_rows
MySQLi_Result
PHP Manual