两个变量如果为空则为其他

Question

对不起,我是PHP的菜鸟,需要帮助.我有两个变量

<?php echo $LOGO ?>
<?php echo $TITLE ?>

所以我需要做的是,如果LOGO为空,则脚本必须显示标题,但如果设置了徽标,则必须仅显示徽标.

非常感谢!

Answer 1

<?php echo (empty($LOGO) ? $TITLE : $LOGO) ?>

如果$ LOGO为空,将显示$ TITLE.否则只会显示$ LOGO.

该运算符称为三元运算符.

empty 像这样工作:

The following things are considered to be empty:

- "" (an empty string)
- 0 (0 as an integer)
- 0.0 (0 as a float)
- "0" (0 as a string)
- NULL
- FALSE
- array() (an empty array)
- $var; (a variable declared, but without a value)