In php manual http://php.net/manual/en/mysqli-stmt.bind-param.php
I see code like this:
$stmt->bind_param('sssd', $code, $language, $official, $percent);
$code = 'DEU';
$language = 'Bavarian';
$official = "F";
$percent = 11.2;
/* execute prepared statement */
$stmt->execute();
The bind_param() method stores references to the values of the $code, $language, $official and $percent variables. The references are stored inside the $stmt object.
When you then give the variables values the $stmt object already knows where to look for the values.
We can create a class, that does this, ourselves:
class Play {
protected $reference;
public function bind( & $variable) {
$this->reference = &$variable;
}
public function show() {
echo "{$this->reference}<br>\n";
}
}
The & character is the reference operator. When you use it you get a reference to the value of another variable.
With this class we can create an object and have some fun:
$play = new Play;
$play->bind($string);
$string = 'Hello!';
$play->show();
$string = 'World!';
$play->show();
No php can't use a variable before you write the declaration!
No language is obviously able to output a value, before it exists.
