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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

Descripción

Estilo orientado a objetos

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

Estilo por procedimientos

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.

Nota: Esta función define campos NULOS al valor null de PHP.

Parámetros

result

Sólo estilo por procedimientos: Un conjunto de identificadores de resultados devuelto por 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.

Valores devueltos

Returns a single column from the next row of a result set or false if there are no more rows.

Advertencia

There is no way to return another column from the same row if you use this function to retrieve data.

Ejemplos

Ejemplo #1 mysqli_result::fetch_column() example

Estilo orientado a objetos

<?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);
}

Estilo por procedimientos

<?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);
}

El resultado de los ejemplos sería algo similar a:

Rafah
Nablus
Jabaliya
Hebron
Khan Yunis

Ver también

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