mysqli查询返回false，但没有错误消息

Question

I have a very straightforward SELECT query within the context of a PHP class which is returning false (failed) but I am unable to retrieve the associated error information. The odd thing is that the call worked fine until I had to reorganize the mysql database - without revising the PHP code obviously it fails - the result is false - but where is the error message?

Code is as follows:

<?php
class Database {
    private $_connection;
    private $_result;
    private $_lastQuery;
    private $_error;

    public function __construct($dbase) {
        $this->_connection = new mysqli(DB_SERVER, DB_USER, DB_PASS, $dbase);
        if (mysqli_connect_error()) {
            trigger_error("failed to connect to MySQL: " . mysqli_connect_error(), E_USER_ERROR);
        }
        mysqli_set_charset($this->_connection, 'utf8');
    }

    public function query($query) {
        $this->_lastQuery = $query;
        $this->_result = mysqli_query($this->_connection, $query);
        $this->_error = $this->_connection->error;
        return $this->_result;
    }
}

No error string appears in $this->_error; also not revealed when inspected during debugging (PHPStorm). When executing the query via the command line, the (expected) error messaging is generated.

Answer 1

看来问题出在xdebug。