mysqli_result::fetch_column
mysqli_fetch_column
(PHP 8 >= 8.1.0)
mysqli_result::fetch_column -- mysqli_fetch_column — Fetch a single column from the next row of a result set
Beschreibung
Objektorientierter Stil
$column = 0): null|int|float|string|falseProzeduraler Stil
Fetches one row of data from the result set and returns the 0-indexed column.
Each subsequent call to this function will return the value from the next row
within the result set, or false if there are no more rows.
Hinweis: Diese Funktion setzt NULL-Felder auf den PHP Wert-
null.
Parameter-Liste
-
result -
Nur bei prozeduralem Aufruf: Ein von mysqli_query(), mysqli_store_result(), mysqli_use_result() oder mysqli_stmt_get_result() zurückgegebenes mysqli_result-Objekt.
-
column -
0-indexed number of the column you wish to retrieve from the row. If no value is supplied, the first column will be returned.
Rückgabewerte
Returns a single column
from the next row of a result set or false if there are no more rows.
There is no way to return another column from the same row if you use this function to retrieve data.
Beispiele
Beispiel #1 mysqli_result::fetch_column() example
Objektorientierter Stil
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
$query = "SELECT CountryCode, Name FROM City ORDER BY ID DESC LIMIT 5";
$result = $mysqli->query($query);
/* fetch a single value from the second column */
while ($Name = $result->fetch_column(1)) {
printf("%s\n", $Name);
}
Prozeduraler Stil
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = mysqli_connect("localhost", "my_user", "my_password", "world");
$query = "SELECT CountryCode, Name FROM City ORDER BY ID DESC LIMIT 5";
$result = mysqli_query($mysqli, $query);
/* fetch a single value from the second column */
while ($Name = mysqli_fetch_column($result, 1)) {
printf("%s\n", $Name);
}
Die oben gezeigten Beispiele erzeugen eine ähnliche Ausgabe wie:
Rafah Nablus Jabaliya Hebron Khan Yunis
Siehe auch
- mysqli_fetch_all() - Fetch all result rows as an associative array, a numeric array, or both
- mysqli_fetch_array() - Fetch the next row of a result set as an associative, a numeric array, or both
- mysqli_fetch_assoc() - Fetch the next row of a result set as an associative array
- mysqli_fetch_object() - Fetch the next row of a result set as an object
- mysqli_fetch_row() - Fetch the next row of a result set as an enumerated array
- mysqli_data_seek() - Adjusts the result pointer to an arbitrary row in the result
