mysqli::$error

(PHP 5, PHP 7)

Returns a string description of the last error

string mysqli_error ( mysqli $link )

Object oriented style

string $mysqli->error;

Procedural style

Returns the last error message for the most recent MySQLi function call that can succeed or fail.

Parameters:

link

Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init()

Returns:

A string that describes the error. An empty string if no error occurred.

Examples:

$mysqli->error example

Object oriented style

<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if ($mysqli->connect_errno) {
    printf("Connect failed: %s\n", $mysqli->connect_error);
    exit();
}

if (!$mysqli->query("SET a=1")) {
    printf("Errormessage: %s\n", $mysqli->error);
}

/* close connection */
$mysqli->close();
?>

Procedural style

<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

if (!mysqli_query($link, "SET a=1")) {
    printf("Errormessage: %s\n", mysqli_error($link));
}

/* close connection */
mysqli_close($link);
?>

The above examples will output:

Errormessage: Unknown system variable 'a'