<?php
/**
* -----------------------------------------------
* echo Foo::start(3)->plus(2)->minus(.4)->is();
* -----------------------------------------------
*/
class Foo {
public static $init = 0;
public static function start($num) {
self::$init = $num;
return new static;
}
public static function plus($num) {
self::$init += $num;
return new static;
}
public static function minus($num) {
self::$init -= $num;
return new static;
}
public static function is() {
return self::$init;
}
}
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