讯息不会回显

Question

So I have in my DB.php

 public function query($sql, $params = array()){
    $this->_error = false;
    if($this->_query = $this->_pdo->prepare($sql)){
        echo "Success";
    }
}

And in my index.php I have this DB::getInstance()->query("SELECT username FROM users") . Why doesn't it echo Success ?

Answer 1

Try using the double equals... ==

Your code now is an assignment in the if statement with one equals.

The code in question now is: if($this->_query = $this->_pdo->prepare($sql)){

Try changing this line of code to if($this->_query == $this->_pdo->prepare($sql)){

I hope this helps. I do not use the object-oriented style of PHP for the most part, but have used the procedural coding style of PHP quiet a bit.