PHP Dokumentation: Mysqli-result lengths
12. Januar 2010 von werner
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
Beschreibung
Object oriented style (property):
Procedural style:
The mysqli_fetch_lengths() function returns an array containing the lengths of every column of the current row within the result set.
Parameter-Liste
- result
Nur bei prozeduralem Aufruf: Ein vonmysqli_query(), mysqli_store_result()oder mysqli_use_result() zurückgegebenesErgebnisobjekt.
Rückgabewerte
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.
Beispiele
Beispiel #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();
?>Beispiel #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);
?>Das oben gezeigte Beispiel erzeugt folgendeAusgabe:
Field 1 has Length 3Field 2 has Length 5Field 3 has Length 13Field 4 has Length 9Field 5 has Length 6Field 6 has Length 1Field 7 has Length 6Field 8 has Length 4Field 9 has Length 6Field 10 has Length 6Field 11 has Length 5Field 12 has Length 44Field 13 has Length 7Field 14 has Length 3Field 15 has Length 2
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