Strings are a wonderful thing in programming. Any character that you can read on screen is considered a string.
Tutorial Details:
PHP Tutorial
In fact, this very text your reading right now can be considered a string. Forming complex strings is a tricky business, especially when you want to format multiple strings in a specific way.
Fortunately for us, PHP includes a huge library of string manipulation functions though huge as it is, it is still not enough when we want to format complex strings like mentioned before. Using a few tricks, we can however create several wrapper functions that we can use for our benefit.
Before reading this tutorial, make sure you have a proper understanding of PHP, strings in general, and a little understanding of regular expressions.
One of the most common ideas behind web development today is that the surfer browsing your web site is in charge. They can register via HTML forms, vote in polls, or even in the concept of some web sites, create new content to be posted online almost instantly.
The problem behind these ideas is basically you have no control over what kind of data the user enters in each of the HTML forms described above. There are other tutorials to explain how to validate the data to make sure it follows a specific pattern; this is outside the scope of this tutorial. Rather here we talk about formatting the string, removing or shifting specific characters from it.
We all know, as programmers, strings are made up of just more than the characters we see. We are all familiar with the famous \n , \t, and \r characters. These nifty characters stand for line break, tab , and carriage return, respectively. What do they mean however?
Each one of these characters make up one byte and they are used to format the string we are dealing with. A string that spans 4 lines for example will most likely contain 4 line break characters. The human eye does not see them though, only they machine does. In fact when the machine encounters a line break character it does not print it on screen, but rather prints any other characters following it on a new line.
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