And require the difference 1.include
1 different treatment that failed to load
include and require in addition to the different ways of processing import documents, the biggest difference is:
include a warning is generated and the script continues to be down at the time of the introduction of the absence of documents;
It will cause the script to stop running when an error occurs require the introduction of documents;
The difference between include and include_once
When referring to the same file multiple times can be performed include include_once performed only once;
The difference between require and require_once
When referring to the same file can be executed multiple times require require_once performed only once;