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mysqli_result::fetch_column

mysqli_fetch_column

(PHP 8 >= 8.1.0)

mysqli_result::fetch_column -- mysqli_fetch_columnFetch a single column from the next row of a result set

Beschreibung

Objektorientierter Stil

public mysqli_result::fetch_column(int $column = 0): null|int|float|string|false

Prozeduraler Stil

mysqli_fetch_column(mysqli_result $result, int $column = 0): null|int|float|string|false

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.

Warnung

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 ($Name mysqli_fetch_column($result1)) {
    
printf("%s\n"$Name);
}

Oben gezeigte Beispiele erzeugen eine ähnliche Ausgabe wie:

Rafah
Nablus
Jabaliya
Hebron
Khan Yunis

Siehe auch

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