(PHP 5, PHP 7, PHP 8)
mysqli::$errno -- mysqli_errno — Returns the error code for the most recent function call
Object-oriented style
Procedural style
Returns the last error code for the most recent MySQLi function call that can succeed or fail.
mysqlProcedural style only: A mysqli object returned by mysqli_connect() or mysqli_init()
An error code value for the last call, if it failed. zero means no error occurred.
Example #1 $mysqli->errno 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("Errorcode: %d\n", $mysqli->errno);
}
/* 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("Errorcode: %d\n", mysqli_errno($link));
}
/* close connection */
mysqli_close($link);
?>
The above examples will output:
Errorcode: 1193