Community Learn Tools Library Leisure
search
English
Home > Backend Development > PHP Tutorial > php三元运算符

php三元运算符

WBOY
Release： 2016-06-06 20:36:36
Original
1302 people have browsed it

php三元运算符

帮朋友问的。不清楚怎么讲。

回复内容：

php三元运算符

帮朋友问的。不清楚怎么讲。

这是 PHP 新版本增加的特性， $a ?: $b 就相当于 $a ? $a : $b 。一般用来判断值是否存在给默认值的时候比较方便。

http://php.net/manual/zh/language.operators.comparison.php#language.op...

Related labels：
php
source：php.cn
Previous article：PHP跨域获取上一页URL问题 Next article：请问一下，一个小的问题， SDK 和 API 的区别有什么区别
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
PHP arrays obtained from URL parameters do not behave as expected I have a URL parameter that contains the category ID and I want to treat it as an array li...
From 2024-04-06 22:09:02
0
1
1428
Where should I place CustomLog directive in apache I'm using php:7.2-apachedocker. I need to disable health check url login access log. Based...
From 2024-04-06 22:03:59
0
1
990
What is the format of the variables in the return value? I am a new learner of php. I found a piece of code: if($x<time()){return[false,'error']...
From 2024-04-06 21:55:20
0
1
778
Problems encountered when using opentbs to generate odt files: values ​​of the same key are displayed in the same row instead of separate columns. I'm using a library called OpenTbs to create odt using PHP, I'm using it because columns a...
From 2024-04-06 20:18:18
0
1
483
Group MySQL results by ID for looping over I have a table with flight data in mysql. I'm writing a php code that will group and displ...
From 2024-04-06 17:27:56
0
1
406
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template