empty quotes in $_POST array php

Question

This is the entire contents of my $_Post array

'name' => 'Jon Doe'
'email' => 'jon@jondoe.com' 
'age' => 22
'action' => ''

What value will $action have after the following PHP statement is executed?

$action = (empty($_POST['action'])) ? 'default' : $_POST['action'];

Answer 1

如果 （强调）代码示例是$ _POST数组的输出，则三元表达式后的值将为'default'...尽管值得注意的是您不需要条件周围的括号，因此可以更改它到：

$action = empty($_POST['action']) ? 'default' : $_POST['action'];

Answer 2

default

http://php.net/manual/en/function.empty.php