相关疑难解决方法(0)

What is this?

This is a collection of questions that come up every now and then about syntax in PHP. This is also a Community Wiki, so everyone is invited to participate in maintaining this list.

Why is this?

It used to be hard to find questions about operators and other syntax tokens.¹
The main idea is to have links to existing questions on Stack Overflow, so it's easier for us to reference them, not to copy over content from …

可能重复: 什么是PHP运算符"？"和":"被调用,它们做了什么？

来自http://twitto.org/

<?PHP
    require __DIR__.'/c.php';
    if (!is_callable($c = @$_GET['c'] ?: function() { echo 'Woah!'; }))
        throw new Exception('Error');
    $c();
?>

Twitto使用从PHP 5.3开始提供的几个新功能:

1. 将DIR不变
2. 运营商
3. 匿名功能

1. 在PHP 5.3 中,数字2对？:做什么？

2. 另外,匿名函数是什么意思？那不是已经存在了一段时间的东西吗？