PHP默认发布值

Question

I have some simple code what gets user inserted parameters. But how can I use $_POST to set a default value? For example, if a user is asked to input name and age and he chose to input only the name I need that $_POST sets age to 0.

My code what I use:

$name = $_POST['name'];
$weight= $_POST['weight'];
$size =   $_POST['size'];

And sometimes there can be only weight or size so I need to set up default value. I tried $size = $_POST['size'] ?? 0; but it not worked.

Answer 1

You can use ternary operator to set default values for non-required fields.

$name = $_POST['name'];
$weight= (!empty($_POST['weight'])) ? $_POST['weight'] : 0;
$size =   (!empty($_POST['size'])) ? $_POST['size'] : 0;

Reference:-

empty()

Note:- You can do same for name also like:-

$name = (!empty($_POST['name'])) ? $_POST['name'] : '';

Remark:- Null coalescing operator ?? only worked in php 7+