PHP Manual
mysqli
Returns a description of the last connection error

mysqli::$connect_error

mysqli_connect_error

(PHP 5, PHP 7, PHP 8)

mysqli::$connect_error -- mysqli_connect_error — Returns a description of the last connection error

Description

Object-oriented style

?string $mysqli->connect_error;

Procedural style

mysqli_connect_error(): ?string

Returns the error message from the last connection attempt.

Parameters

This function has no parameters.

Return Values

A string that describes the error. null is returned if no error occurred.

Examples

Example #1 $mysqli->connect_error example

Object-oriented style


<?php

mysqli_report(MYSQLI_REPORT_OFF);
/* @ is used to suppress warnings */
$mysqli = @new mysqli('localhost', 'fake_user', 'wrong_password', 'does_not_exist');
if ($mysqli->connect_error) {
    /* Use your preferred error logging method here */
    error_log('Connection error: ' . $mysqli->connect_error);
}

Procedural style


<?php

mysqli_report(MYSQLI_REPORT_OFF);
/* @ is used to suppress warnings */
$link = @mysqli_connect('localhost', 'fake_user', 'wrong_password', 'does_not_exist');
if (!$link) {
    /* Use your preferred error logging method here */
    error_log('Connection error: ' . mysqli_connect_error());
}