PHP 7.0.6 Released

    mysqli::get_warnings

    mysqli_get_warnings

    (PHP 5 >= 5.1.0, PHP 7)

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

    Description

    Object oriented style

    mysqli_warning mysqli::get_warnings ( void )

    Procedural style

    mysqli_warning mysqli_get_warnings ( mysqli $link )
    Warning

    This function is currently not documented; only its argument list is available.

    User Contributed Notes

    marcus at synchromedia dot co dot uk
    6 years ago
    With a bit of rooting about with reflection, I spotted that the mysqli_warning class has a next() function, so I tried calling it and it does indeed progress through the available warnings! Following on from my earlier example:

    <?php
    $r     = mysqli_query($db, "INSERT INTO blah SET z = '1'");
    $j = mysqli_warning_count($db);
    if (    $j > 0) {
            $e = mysqli_get_warnings($db);
        for (    $i = 0; $i < $j; $i++) {
                var_dump($e);
                $e->next();
        }
    }
    ?>

    There is a simple way of traversing the warnings:

    <?php
    $r     = mysqli_query($db, "INSERT INTO blah SET z = '1'");
    if (    mysqli_warning_count($db)) {
           $e = mysqli_get_warnings($db);
       do {
           echo     "Warning: $e->errno: $e->message\n";
       } while (    $e->next());
    }
    ?>
    Anonymous
    2 years ago
    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.
    marcus at synchromedia dot co dot uk
    6 years ago
    I'm not sure how useful this function is as implemented. Take this example:

    CREATE TABLE `blah` (
      `x` varchar(100) NOT NULL,
      `y` varchar(100) NOT NULL,
      `z` varchar(100) NOT NULL
    ) ENGINE=InnoDB DEFAULT CHARSET=latin1;

    INSERT INTO blah SET z = '1';
    Query OK, 1 row affected, 2 warnings (0.00 sec)

    mysql> show warnings;
    +---------+------+----------------------------------------+
    | Level   | Code | Message                                |
    +---------+------+----------------------------------------+
    | Warning | 1364 | Field 'x' doesn't have a default value |
    | Warning | 1364 | Field 'y' doesn't have a default value |
    +---------+------+----------------------------------------+

    Doing the same from PHP using mysqli_get_warnings(), you get this instead:

    object(mysqli_warning)#4 (3) {
      ["message"]=>
      string(38) "Field 'x' doesn't have a default value"
      ["sqlstate"]=>
      string(5) "HY000"
      ["errno"]=>
      int(1364)
    }

    i.e. it only returns the first warning. I suspect it should return an array of these objects rather than just one. At least you know what the return value looks like now, since the docs don't say!
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