PHP for the Web: Visual QuickStart Guide, Fourth Edition

5. Using Strings

In This Chapter

Creating the HTML Form 92

Concatenating Strings 95

Handling Newlines 98

HTML and PHP 100

Encoding and Decoding Strings 103

Finding Substrings 107

Replacing Parts of a String 111

Review and Pursue 114

As introduced in Chapter 2, “Variables,” a second category of variables used by PHP is strings—a collection of characters enclosed within either single or double quotation marks. A string variable may consist of a single letter, a word, a sentence, a paragraph, HTML code, or even a jumble of nonsensical letters, numbers, and symbols (which might represent a password). Strings may be the most common variable type used in PHP.

This chapter covers PHP’s most basic built-in functions and operators for manipulating ...