function main()
{
$use_by_val = 123;
$use_by_ref = 1000;
$c = function ($arg, $dv = 500) use($use_by_val, &$use_by_ref) {
$use_by_val *= 2;
$use_by_ref *= 2;
echo "Use: {$use_by_val} {$use_by_ref}\n";
funk($arg, $dv);
};
if (!$c instanceof Closure) {
echo "Closure isn't instanceof closure!\n";
}
if (!is_callable($c)) {
echo "Closure isn't callable!\n";
}
$c(777);
call_user_func($c, 888);
var_dump($c);
var_dump($use_by_val, $use_by_ref);
}
<?php
function funk($asi)
{
$asi = $asi * 2;
return $asi;
}
$olemas = "asi";
$sedasi = "on küll jah";
$ah = "mis värk on?";
$üks_muutuja_veel_juurde = "lihtne";
echo funk(20);
