PHP mysql_data_seek function

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mysql_data_seek

(PHP 3, PHP 4, PHP 5)

mysql_data_seek() moves the internal row
pointer of the MySQL result associated with the specified result
identifier to point to the specified row number. The next call
to a MySQL fetch function, such as mysql_fetch_assoc(),
would return that row.

row_number starts at 0. The
row_number should be a value in the range from 0 to
mysql_num_rows() – 1. However if the result set
is empty (mysql_num_rows() == 0), a seek to 0 will
fail with a E_WARNING and
mysql_data_seek() will return FALSE.

The result resource that
is being evaluated. This result comes from a call to
mysql_query().

The desired row number of the new result pointer.

Returns TRUE on success or FALSE on failure.

Example 1. mysql_data_seek() example

$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
    die('Could not connect: ' . mysql_error());
}
$db_selected = mysql_select_db('sample_db');
if (!$db_selected) {
    die('Could not select database: ' . mysql_error());
}
$query = 'SELECT last_name, first_name FROM friends';
$result = mysql_query($query);
if (!$result) {
    die('Query failed: ' . mysql_error());
}
/* fetch rows in reverse order */
for ($i = mysql_num_rows($result) - 1; $i >= 0; $i--) {
    if (!mysql_data_seek($result, $i)) {
        echo "Cannot seek to row $i: " . mysql_error() . "\n";
        continue;
    }
 
    if (!($row = mysql_fetch_assoc($result))) {
        continue;
    }
 
    echo $row['last_name'] . ' ' . $row['first_name'] . "<br />\n";
}
 
mysql_free_result($result);

Note:
The function mysql_data_seek() can be used in
conjunction only with mysql_query(), not with
mysql_unbuffered_query().