Modifying string contents
Using regular expressions for pattern matching and extraction.
Joining and splitting strings
The Web is largely a text-oriented environment. Data is submitted to websites in the form of text strings, and the response (be it in HTML, XML, or even an image format) is generally text as well. Accordingly, being able to analyze and manipulate text is a core skill of any PHP programmer.
In this section, you will learn how to test whether two strings are equal, or whether one string exists inside of another string.