Getting Good with PHP by Andrew Burgess
By Andrew Burgess
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That’s the if statement and his buddies for you. There is one more thing to remember as we go on with these control; there’s no reason you can’t put an if statement inside of an if statement, or place any of the other control structures within other control structures. Let’s look at some more control structures that we can combine into nested, dynamic programming statements. for / foreach Well, I’ve been getting out more, recently, and my list of friends has grown: $friends = array("Watson", "Mycroft", "Sherlock", "Lestrade"); Let’s say I want to list all four of my friends.
String Functions Let’s start with string functions; you’ll be using strings a lot, so these are good to know. Outputting Strings While we haven’t really talked about outputting strings yet, we’ve certainly done a lot of that using echo, remember? echo isn’t a 54 Chapter 3 real function; it’s a language construct, but we use it similarly to a function. It’s pretty simple: whatever string you pass to echo will be outputted. You can actually pass multiple strings to it and they will be concatenated and outputted.
Similarly, if the first operand in a use of the Or operator is true, there’s no need to 34 Chapter 2 go on to the second one. It’s important to remember this if you’re using functions as operands. You’ll learn in the next section that functions return values similarly to operators: keep in mind that if the function call is the second operand, it won’t be called unless it needs to be. Conditional Operator The last operator we’ll look at is the conditional operator. It’s also called the ternary operator, because it’s the only operator that takes three operands.