How to use php anonymous functions and use clauses

Look at the code below

function test()
{
	$param2 = 'every';
	// 返回一个匿名函数
	return function ($param1) use ($param2) {
		// use子句 让匿名函数使用其作用域的变量
		$param2 .= 'one';
		print $param1 . ' ' . $param2;
	};
}

$anonymous_func = test();
$anonymous_func('hello');

The output is hello world

$param1 and $param2 are closure variables

The following method outputs hello everyone

function test()
{
	$param2 = 'everyone';
	$func = function ($param1) use ($param2) {
		// use子句 让匿名函数使用其父作用域的变量
		print $param1 . ' ' . $param2;
	};
	$param2 = 'everybody';

	return $func;
}

$anonymous_func = test();
$anonymous_func('hello');

The following method outputs hello everybody

There is one more in $param2Quote

function test()
{
	$param2 = 'everyone';
	$func = function ($param1) use (&$param2) {
		// use子句 让匿名函数使用其父作用域的变量
		print $param1 . ' ' . $param2;
	};
	$param2 = 'everybody';

	return $func;
}

$anonymous_func = test();
$anonymous_func('hello');

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