I'm studying php7 and I've seen somewhere that it's now possible to use external function variables, but they're in the same file. From what I remember it was something like this:
<?php
$agua = '1 Litro';
function listaDeCoisas($item1,$item2) use $agua{
return 'Lista: '.$item1.','.$item2.', Agua: '. $agua;
}
I want to know if this is really possible and how to use it!
This was already possible in older versions. You can use the scope global .
Example:
$msg = "Olá!";
function exibeMsg()
{
global $msg;
echo $msg;
}
exibeMsg(); // Imprimirá "Olá!"
You can access the variable "outside" the function, regardless of whether it is in the file in question or in an included file.
I think you want to do this with anonymous functions. Also known as clousures , they are available from PHP 5.3 :
$agua = '1 Litro';
$garraga = function ($item1,$item2) use ($agua) {
return 'Lista: '.$item1.','.$item2.', Agua: '. $agua;
}
echo $garrafa();
What went back in PHP 7 which looks like this are the anonymous classes . They are useful for creating specific classes and are unlikely to be reused.
// PHP 5
class Logger
{
public function log($msg)
{
echo $msg;
}
}
$util->setLogger(new Logger());
// Opção no PHP 7+
$util->setLogger(new class {
public function log($msg)
{
echo $msg;
}
});
The keyword use is only allowed in anonymous functions or clousures as in the example below;
$message = 'Hello';
$example = function () use ($message) {
var_dump($message);
};
$example();