(PHP 5, PHP 7)
mysqli::$error -- mysqli_error — Returns a string description of the last error
Object oriented style
Procedural style
mysqli_error ( mysqli $link ) : string
Returns the last error message for the most recent MySQLi function call that can succeed or fail.
link
Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init()
A string that describes the error. An empty string if no error occurred.
Example #1 $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("Error message: %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("Error message: %s\n", mysqli_error($link));
}
/* close connection */
mysqli_close($link);
?> The above examples will output:
Error message: Unknown system variable 'a'
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https://www.php.net/manual/en/mysqli.error.php