7.3.8.16 mysqli::$field_count, mysqli_field_count

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• mysqli::$field_count

  mysqli_field_count

  Returns the number of columns for the most recent query

Description

Object-oriented style

int mysqli->field_count ;

Procedural style

int mysqli_field_count(mysqli mysql);

Returns the number of columns for the most recent query on the connection represented by the mysql parameter. This function can be useful when using the mysqli_store_result function to determine if the query should have produced a non-empty result set or not without knowing the nature of the query.

Parameters

mysql

Procedural style only: A mysqli object returned by mysqli_connect or mysqli_init

Return Values

An integer representing the number of fields in a result set.

Examples

Example 7.51 $mysqli->field_count example

Object-oriented style

<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");
$mysqli->query( "DROP TABLE IF EXISTS friends");
$mysqli->query( "CREATE TABLE friends (id int, name varchar(20))");
$mysqli->query( "INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");
$mysqli->real_query("SELECT * FROM friends");
if ($mysqli->field_count) {
    /* this was a select/show or describe query */
    $result = $mysqli->store_result();
    /* process resultset */
    $row = $result->fetch_row();
    /* free resultset */
    $result->close();
}
/* close connection */
$mysqli->close();
?>

Procedural style

<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "test");
mysqli_query($link, "DROP TABLE IF EXISTS friends");
mysqli_query($link, "CREATE TABLE friends (id int, name varchar(20))");
mysqli_query($link, "INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");
mysqli_real_query($link, "SELECT * FROM friends");
if (mysqli_field_count($link)) {
    /* this was a select/show or describe query */
    $result = mysqli_store_result($link);
    /* process resultset */
    $row = mysqli_fetch_row($result);
    /* free resultset */
    mysqli_free_result($result);
}
/* close connection */
mysqli_close($link);
?>