PHP -- differences between isset and empty

: This article mainly introduces the differences between isset and empty in PHP. if you are interested in PHP tutorials, refer to them.

Reprinted please indicate the source: http://blog.csdn.net/l1028386804/article/details/48595811

Isset (variable) determines whether a variable exists or whether it is null. if it exists, it is true. Otherwise, it is false.

Empty (variable): determines whether the content of a variable is null (not null, but no content). basically, some rules are as follows ": 0, "", "0", false, null, array () empty array is also empty,

If the content of a variable is empty, empty () returns true; otherwise, false.

The above introduces the difference between isset and empty in PHP, including some content, and hopes to help those who are interested in PHP tutorials.