
示例 – PHP7之前
<?php class A { private $x = 1; } // Define a closure Pre PHP 7 code $getValue = function() { return $this->x; }; // Bind a clousure $value = $getValue->bindTo(new A, 'A'); print($value()); ?>
1
示例 – PHP7+
<?php class A { private $x = 1; } // PHP 7+ code, Define $value = function() { return $this->x; }; print($value->call(new A)); ?>
这将在浏览器产生输出以下结果-
1