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
Descrizione
Stile orientato agli oggetti
Stile procedurale
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.
Nota: Questa funzione imposta i campio NULL al valore PHP
null.
Elenco dei parametri
-
result -
Solo nello stile procedurale: un identificatore di resultset restituito da mysqli_query(), mysqli_store_result() o mysqli_use_result().
-
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.
Valori restituiti
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.
Esempi
Example #1 mysqli_result::fetch_column() example
Stile orientato agli oggetti
<?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);
}Stile procedurale
<?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);
}The above examples will output something similar to:
Rafah Nablus Jabaliya Hebron Khan Yunis
Vedere anche:
- 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
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