Get result of SHOW WARNINGS

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- PHP Manual
- mysqli
- Get result of SHOW WARNINGS

# mysqli::get_warnings

# mysqli_get_warnings

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

mysqli::get_warnings -- mysqli_get_warnings — Get result of SHOW WARNINGS

### Description

Object-oriented style

public mysqli::get_warnings(): mysqli_warning|false

Procedural style

mysqli_get_warnings(mysqli `$mysql`): mysqli_warning|false

Returns a singly linked list comprised of mysqli_warning or `false` if there are no warnings. Each object in the list corresponds to a single line from the result of `SHOW WARNINGS`. Calling mysqli_warning::next() will refill the object with the values from the next row.

> Note: To retrieve warning messages, it is recommended to use the SQL command `SHOW WARNINGS [limit row_count]` instead of this function.

Warning

The linked list cannot be rewound or retrieved again.

### Parameters

`mysql`

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

### Return Values

Returns a singly linked list comprised of mysqli_warning or `false` if there are no warnings.

### Examples

Example #1 Traversing the linked list to fetch all warnings

Object-oriented style

    <?php

    mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    $mysqli = new mysqli("localhost", "my_user", "my_password", "world");

    $mysqli->query("SELECT 1/0, CAST('NULL' AS UNSIGNED)");

    if ($mysqli->warning_count > 0) {
        $warning = $mysqli->get_warnings();
        if ($warning !== false) {
            do {
                printf("Error number: %s\n", $warning->errno);
                printf("Message: %s\n", $warning->message);
            } while ($warning->next());
        }
    }

Procedural style

    <?php

    mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    $link = mysqli_connect("localhost", "user", "password", "test");

    mysqli_query($link, "SELECT 1/0, CAST('NULL' AS UNSIGNED)");

    if (mysqli_warning_count($link) > 0) {
        $warning = mysqli_get_warnings($link);
        if ($warning !== false) {
            do {
                printf("Error number: %s\n", $warning->errno);
                printf("Message: %s\n", $warning->message);
            } while ($warning->next());
        }
    }

The above examples will output:

    Error number: 1365
    Message: Division by 0
    Error number: 1292
    Message: Truncated incorrect INTEGER value: 'NULL'