The previous chapters covered the most widely used extensions. This chapter presents other valuable mainstream extensions. The first section describes a group of functions that are part of the core PHP, not a separate extension. The remaining sections discuss several popular and useful extensions that are not part of the core PHP.
After you finish reading this chapter, you will have learned
Open, read, and write local and remote files
Communicate with processes and programs
Work with streams
Match text, validate input text, replace text, split text, and other text manipulations using regular expressions with PHP functions
Handle parsing and formatting dates and times, including DST issues
Build images with the GD extension