PHP Manual
mysqli_result
Adjusts the result pointer to an arbitrary row in the result

mysqli_result::data_seek

mysqli_data_seek

(PHP 5, PHP 7, PHP 8)

mysqli_result::data_seek -- mysqli_data_seek — Adjusts the result pointer to an arbitrary row in the result

Description

Object-oriented style

public mysqli_result::data_seek(int $offset): bool

Procedural style

mysqli_data_seek(mysqli_result $result, int $offset): bool

The mysqli_data_seek() function seeks to an arbitrary result pointer specified by the offset in the result set.

Parameters

result: Procedural style only: A mysqli_result object returned by mysqli_query(), mysqli_store_result(), mysqli_use_result() or mysqli_stmt_get_result().
offset: The row offset. Must be between zero and the total number of rows minus one (0..mysqli_num_rows() - 1).

Return Values

Returns true on success or false on failure.

Examples

Example #1 mysqli::data_seek() example

Object-oriented style


<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

$query = "SELECT Name, CountryCode FROM City ORDER BY Name";
$result = $mysqli->query($query);

/* Seek to row no. 401 */
$result->data_seek(400);

/* Fetch single row */
$row = $result->fetch_row();

printf("City: %s  Countrycode: %s\n", $row[0], $row[1]);

Procedural style


<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "world");

$query = "SELECT Name, CountryCode FROM City ORDER BY Name";

$result = mysqli_query($link, $query);

/* Seek to row no. 401 */
mysqli_data_seek($result, 400);

/* Fetch single row */
$row = mysqli_fetch_row($result);

printf ("City: %s  Countrycode: %s\n", $row[0], $row[1]);

The above examples will output:

City: Benin City  Countrycode: NGA

Example #2 Adjusting the result pointer when iterating

This function can be useful when iterating over the result set to impose a custom order or rewind the result set when iterating multiple times.


<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

$query = "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 15,4";
$result = $mysqli->query($query);

/* Iterate the result set in reverse order */
for ($row_no = $result->num_rows - 1; $row_no >= 0; $row_no--) {
    $result->data_seek($row_no);

    /* Fetch single row */
    $row = $result->fetch_row();

    printf("City: %s  Countrycode: %s\n", $row[0], $row[1]);
}

/* Reset pointer to the beginning of the result set */
$result->data_seek(0);

print "\n";

/* Iterate the same result set again */
while ($row = $result->fetch_row()) {
    printf("City: %s  Countrycode: %s\n", $row[0], $row[1]);
}

The above examples will output:

City: Acmbaro  Countrycode: MEX
City: Abuja  Countrycode: NGA
City: Abu Dhabi  Countrycode: ARE
City: Abottabad  Countrycode: PAK

City: Abottabad  Countrycode: PAK
City: Abu Dhabi  Countrycode: ARE
City: Abuja  Countrycode: NGA
City: Acmbaro  Countrycode: MEX

Notes

Note:
This function can only be used with buffered results attained from the use of the mysqli_store_result(), mysqli_query() or mysqli_stmt_get_result() functions.