Take note:
Calling this function will change the output of mysqli_affected_rows if any warnings are returned. So if you're using mysqli_affected_rows in your application, make sure to call it before calling mysqli_get_warnings.
(PHP 5 >= 5.1.0, PHP 7, PHP 8)
mysqli::get_warnings -- mysqli_get_warnings — Get result of SHOW WARNINGS
Object-oriented style
Procedural style
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.
The linked list cannot be rewound or retrieved again.
mysqlProcedural style only: A mysqli object returned by mysqli_connect() or mysqli_init()
Returns a singly linked list comprised of
mysqli_warning or false if there are no warnings.
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'