1. Beginning PHP
Session #2
October 6, 2011
Josh Butts

2. Agenda for Today
Go over Homework #1
Control Structures
Include & Require
String Functions

3. Control Structures
If - Else statements
Ternary Operator
Switch Statements
Loops

4. If Statements

5. Switch Statements

6. Ternary - A Special If-Else
Shorthand for an IF statement with exactly one else condition
Returns a value to a variable or function rather than running code
Any single expression can be interchanged for any of the sections
outlined below, including variables, functions, even another ternary

7. Loops
Another core language function that is used repetitively (Ha!)
Types
For
Foreach (remember this one)
While
Loops and arrays were meant for each other

8. For Loops

9. Foreach, the mightiest loop

10. While - The Boolean Loop

11. String Functions
You’ll use these all the time
The internet deals in strings
Much like array functions, there are quite a few

12. strlen()
How long is a string, in characters?

13. substr()
Get a smaller part of the whole string

14. str_replace()
search and replace strings within strings
use arrays for extra power

15. strpos()
Finds out the “index” location of a string within a string
Commonly used to find if a string exists within another

16. Changing Case

17. explode()
Split up a string on certain characters and give
back an array of the pieces

18. implode()
Build a string from an array

19. Include
Load another PHP file into the current contexts
Executes that code as if it were in the current file
Gives a warning if the file is not found

20. Include_Once
The same as include, except keeps track of if you’re already
included the file and only includes it once
Use but don’t abuse, there is an implicit speed penalty for
doing this

21. Require
Functions the same way as include except gives a fatal error
if the file is not found
Tends to be used for system components vs. small output
snippets
Require_once == include_once